Why is the "Push changes immediately to origin/master" checkbox disabled in SourceTree?

2023-05-30--05-29-15

Step 1

2023-06-29--03-19-47

Step 2

Restart SourceTree.

Result

2023-06-29--03-23-14

jira.atlassian.com/browse/SRCTREEWIN-13812#comment-3303111
stackoverflow.com/a/76577425