why i dont see booking tab

Thanks for pointing out the oversight on my part. The listing page of all Bookable Calendars is on this page: /admin/content/bookable-calendar

I'm working on getting that tab there for you.

That issue is now fixed in the dev build and beta3 release, feel free to upgrade to either of those to get the fix.

The code for that fix is on this diff if you wanted to just patch your local version: https://git.drupalcode.org/project/bookable_calendar/-/merge_requests/9/...