Undo Does Not Work as Expected
On this page
If Backspace deletes a character instead of undoing a Replacement or an Action, check these causes.
Undo with Backspace is off
Turn on Undo with Backspace in the Detection and replacement section of Settings.
You did something else first
Undo works only as the very next thing after a Replacement. Typing, moving the cursor, or switching fields ends it.
Delete the Template by hand, then type the Keyword again if you need it.
The Action can't be undone
Deleting or cutting all text, or from the start to the cursor, can't be undone.
The Action selected text
Selection Actions leave text selected, so Backspace deletes it.
See Undo after an Action.
Your clipboard changed after a cut
Undoing a cut from the cursor to the end puts the text back in the field, but your clipboard keeps the cut text, not what you copied before.
The Template ran a Command
A Template with a Command can't be undone. Delete the Template by hand.
The app changed the Template
Some apps change the inserted Template right after a Replacement, for example with autocorrect. Undo may then not work. Delete the Template by hand.