add `faTimes` icon to `Hide` button in multiview #976

Job	Run time
build-client / build-client	12m 22s
setup-selenium / setup_chromedriver	3s
Test (3.8, 0)	43m 8s
Test (3.8, 1)	55m 28s
Test (3.8, 2)	51m 51s
	2h 42m 52s

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