by Helen Foster.
Hi Stephanie,
Are you wanting to provide Padlet as an External tool in courses, as described in Add Padlet to Moodle LMS using LTI 1.3?
If so, it's currently not possible to make it so that only certain instructors can see it in the activity chooser.
However, when configuring the tool in the site administration, you can set the tool configuration usage to 'Do not show; use only when a matching tool URL is entered', and then email the tool URL to the 25 instructors.