How to layout like this?

[junmaqiang]

There must be three columns, the left and right columns have the same width, and the rest of the width is for the middle column, which can be adaptive

Here is how I write it now

	// 
	lefts := canvas.NewRectangle(color.NRGBA{0x62, 0x76, 0x99, 0xff})
	lefts.SetMinSize(fyne.NewSize(260, 600))
	// 
	conts := canvas.NewRectangle(color.NRGBA{0x11, 0x22, 0x33, 0xff})
	conts.SetMinSize(fyne.NewSize(360, 600))
	// 
	rights := canvas.NewRectangle(color.NRGBA{0x62, 0x76, 0x88, 0xff})
	rights.SetMinSize(fyne.NewSize(260, 600))
	// 
	con := container.NewAdaptiveGrid(3, lefts, conts, rights)

[andydotxyz]

I think the Border container will do what you want, though I would be very careful about setting a large min-size for items as it will probably break smaller screens.