zabkat support forum

After moving to Windows 11, it turns out the view button on the toolbar tries to open the file in Editor2 instead of opening/closing the quickview pane. Ctrl-F3 and Ctrl-Q still work though. I tried to remove the button and then add it again, but that didn't help.

that's what F3 does, always

On a fresh install F3 is assigned to view and view uses Editor4 by default but you can change what F3 does with customize/keyboard.

There does not seem to be a toolbar button available for Quick viewer even though an icon is shown on the menu but you could make a Quick viewer toolbar button by creating a macro

COMMAND 32934

and putting it on a toolbar.

of course there is a toolbar button for it! it is on by default too

Well I am not seeing a built-in toolbar button for Quick viewer (which toggles the preview pane) and I have looked pretty closely on the toolbar customize dialog on both 5.4.0.2 and 5.4.0.7.

my memory is going down the drain too but i can still find toolbar buttons

Yep! I guess I was focusing on quick so much I was not seeing the built-in button called Preview!