Renaming a root tag doesn't affect its subtags. The only way is to rename all subtags.

Thank you, Dave! I manage 2600 items, 300 tags/subtags, and 5 vaults on 1Pwd 8 Windows-macOS-iOS-iPadOS-Android so it's frequent to notice new issues (I currently have a list of 10). For privacy/efficiency purposes, can issues reports be sent directly to the developers' team, including screen recordings?