It would be great if we could right click the column header or the empty section of the Document List pane to generate a context menu where its possible to enable/disable the Ext column.
With this option available, we can remove the Document List ext disable checkbox from the settings.

A demo of the above,

Edit: I've already created this feature, Just waiting for the green light, additional comments and PR #10464 's acceptance.
And Credit to @ArkadiuszMichalski 's #10463 (comment) and @Yaron10 's 3rd point in #10458 (comment)