diff --git a/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.test.tsx b/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.test.tsx
index a7cc54820774d..3595cefd1220c 100644
--- a/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.test.tsx
+++ b/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.test.tsx
@@ -27,7 +27,11 @@ import {
 
 import { PrivilegesRolesForm } from './space_assign_role_privilege_form';
 import type { Space } from '../../../../../common';
-import { FEATURE_PRIVILEGES_ALL, FEATURE_PRIVILEGES_READ } from '../../../../../common/constants';
+import {
+  FEATURE_PRIVILEGES_ALL,
+  FEATURE_PRIVILEGES_CUSTOM,
+  FEATURE_PRIVILEGES_READ,
+} from '../../../../../common/constants';
 import { spacesManagerMock } from '../../../../spaces_manager/spaces_manager.mock';
 import {
   createPrivilegeAPIClientMock,
@@ -316,6 +320,11 @@ describe('PrivilegesRolesForm', () => {
 
       await userEvent.click(screen.getByTestId('custom-privilege-button'));
 
+      expect(screen.getByTestId(`${FEATURE_PRIVILEGES_CUSTOM}-privilege-button`)).toHaveAttribute(
+        'aria-pressed',
+        String(true)
+      );
+
       expect(
         screen.getByTestId('space-assign-role-privilege-customization-form')
       ).toBeInTheDocument();
@@ -330,5 +339,74 @@ describe('PrivilegesRolesForm', () => {
         String(true)
       );
     });
+
+    it('allows modifying individual features after selecting a base privilege within the customize table', async () => {
+      const user = userEvent.setup();
+
+      getRolesSpy.mockResolvedValue([]);
+      getAllKibanaPrivilegeSpy.mockResolvedValue(createRawKibanaPrivileges(kibanaFeatures));
+
+      const featureIds: string[] = kibanaFeatures.map((kibanaFeature) => kibanaFeature.id);
+
+      const roles: Role[] = [
+        createRole('test_role_1', [
+          { base: [FEATURE_PRIVILEGES_READ], feature: {}, spaces: [space.id] },
+        ]),
+      ];
+
+      renderPrivilegeRolesForm({
+        preSelectedRoles: roles,
+      });
+
+      await waitFor(() => null);
+
+      expect(screen.getByTestId(`${FEATURE_PRIVILEGES_READ}-privilege-button`)).toHaveAttribute(
+        'aria-pressed',
+        String(true)
+      );
+
+      await user.click(screen.getByTestId('custom-privilege-button'));
+
+      expect(screen.getByTestId(`${FEATURE_PRIVILEGES_CUSTOM}-privilege-button`)).toHaveAttribute(
+        'aria-pressed',
+        String(true)
+      );
+
+      expect(
+        screen.getByTestId('space-assign-role-privilege-customization-form')
+      ).toBeInTheDocument();
+
+      // By default all features are set to the none privilege
+      expect(screen.queryByTestId(`${featureIds[0]}_read`)).not.toHaveAttribute(
+        'aria-pressed',
+        String(true)
+      );
+
+      await user.click(screen.getByTestId('changeAllPrivilegesButton'));
+
+      // change all privileges to read
+      await user.click(screen.getByTestId(`changeAllPrivileges-${FEATURE_PRIVILEGES_READ}`));
+
+      featureIds.forEach((_, idx) => {
+        // verify that all features are set to read
+        expect(screen.queryByTestId(`${featureIds[idx]}_read`)).toHaveAttribute(
+          'aria-pressed',
+          String(true)
+        );
+      });
+
+      // change a single feature to all
+      await user.click(screen.getByTestId(`${featureIds[0]}_all`));
+
+      expect(screen.queryByTestId(`${featureIds[0]}_read`)).not.toHaveAttribute(
+        'aria-pressed',
+        String(true)
+      );
+
+      expect(screen.getByTestId(`${featureIds[0]}_all`)).toHaveAttribute(
+        'aria-pressed',
+        String(true)
+      );
+    });
   });
 });
diff --git a/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.tsx b/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.tsx
index 23a7383a01a06..fcb9f8ad2b8cc 100644
--- a/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.tsx
+++ b/x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.tsx
@@ -32,7 +32,7 @@ import type { KibanaFeature, KibanaFeatureConfig } from '@kbn/features-plugin/co
 import { i18n } from '@kbn/i18n';
 import { FormattedMessage } from '@kbn/i18n-react';
 import { type RawKibanaPrivileges } from '@kbn/security-authorization-core';
-import type { Role } from '@kbn/security-plugin-types-common';
+import type { Role, RoleKibanaPrivilege } from '@kbn/security-plugin-types-common';
 import type { BulkUpdateRoleResponse } from '@kbn/security-plugin-types-public/src/roles/roles_api_client';
 import { KibanaPrivileges } from '@kbn/security-role-management-model';
 import { KibanaPrivilegeTable, PrivilegeFormCalculator } from '@kbn/security-ui-components';
@@ -513,10 +513,48 @@ export const PrivilegesRolesForm: FC<PrivilegesRolesFormProps> = (props) => {
                           // apply selected changes only to the designated customization anchor, this way we delay reconciling the intending privileges
                           // to all of the selected roles till we decide to commit the changes chosen
                           setRoleCustomizationAnchor(({ value, privilegeIndex }) => {
-                            let privilege;
+                            let privilege: RoleKibanaPrivilege;
 
                             if ((privilege = value!.kibana?.[privilegeIndex!])) {
-                              privilege.base = _privilege;
+                              // empty out base to setup customizing all features
+                              privilege.base = [];
+
+                              const securedFeatures = new KibanaPrivileges(
+                                kibanaPrivileges,
+                                features
+                              ).getSecuredFeatures();
+
+                              securedFeatures.forEach((feature) => {
+                                const nextFeaturePrivilege = feature
+                                  .getPrimaryFeaturePrivileges({
+                                    includeMinimalFeaturePrivileges: true,
+                                  })
+                                  .find((pfp) => {
+                                    if (pfp?.disabled || pfp?.requireAllSpaces) {
+                                      return false;
+                                    }
+                                    return Array.isArray(_privilege) && _privilege.includes(pfp.id);
+                                  });
+
+                                let newPrivileges: string[] = [];
+
+                                if (nextFeaturePrivilege) {
+                                  newPrivileges = [nextFeaturePrivilege.id];
+                                  feature.getSubFeaturePrivileges().forEach((psf) => {
+                                    if (Array.isArray(_privilege) && _privilege.includes(psf.id)) {
+                                      if (!psf.requireAllSpaces) {
+                                        newPrivileges.push(psf.id);
+                                      }
+                                    }
+                                  });
+                                }
+
+                                if (newPrivileges.length === 0) {
+                                  delete privilege.feature[feature.id];
+                                } else {
+                                  privilege.feature[feature.id] = newPrivileges;
+                                }
+                              });
                             }
 
                             return { value, privilegeIndex };