Thanks for the extra info cinematik
I can, and always have, been able to switch between documents in AR6 smoothly, without needing any form of extra click before I can make a mark.
I’m on a Mac and I would note that there is a problem with the default key combo for switching between documents in AR6 (and still in ARV) as it clashes with the macOS default command for switching between apps.
Because of this, a long time ago, I changed the key command in AR’s ‘Set Keyboard Shortcuts…’ panel.
My commands for switching between documents within AR are now;
Next Document = option+right arrow key
Previous Document = option+left arrow key

I wonder if you try setting new key commands for switching documents, whether it would then work correctly for you?
Before changing any commands I would advise exporting a backup of your current settings first in case you want to return to them.
In the ‘Set Keyboard Shortcuts…’ panel click on the menu icon in the top right corner and choose the ‘Export Shortcuts To File…’ option and save the backup to a convenient location on your system.