This column buttons work like visible button in layer explorer but with different usage, if every layer has "on" isolate button, only this layer can be seen in viewports. We need it because in some projects we have many layers and only we want to see one or some layers and this method will be easier than classic off visible buttons in front of every layers.
We have something like this in Adobe after effect layer toolset.
Also some suggests for this column buttons in layer explorer:
1- If every layer isolate button is ON, all the layer visible column would be off (like after effect).
2- More than one layer's isolate buttons can be ON
3- It's nice for base layer but it will be better if we have this button for every sub-layers too.
