*The ability to click or tap somewhere to reposition the caret in text fields has been added in 1.20.30.22 Preview. However, that feature does not work on some screens:
All signs;
All hanging signs;
New Create world screen.
MCPE-174365
Can't reposition caret by clicking or tapping on some screens
Open
6
(Unassigned)
1061509
Confirmed
Multiple
1.20.30.22 Preview, 1.20.51 Hotfix
26.10.24 Preview
Retrieved
In addition, it doesn't seem to work for most of the first line when in the expanded command block view