Any Keyboard shortcuts to cancel previous action like "Ctrl+Z" in word?

[mlzt2004]

Any Keyboard shortcuts to cancel previous action like "Ctrl+Z" in word? I check the instructions on keyboard shortcuts, but do not find any specific shortcut. Many thanks!

[kjk]

What actions are you talking about, specifically?

[jonnwfei]

I would greatly value a "Ctrl+Z" shortcut to undo any previous annotations or file changes of some sort, e.g. highlighting text, instead of currently having to "Ctrl+click" on my annotation and then manually press the delete annotation button on the popup.
Thank you for your work, I've just recently started using Sumatra and pleases me that its so lightweight.