We also now have the default composer category admin setting, where you can set an existing one to be automatically filled in when the composer opens. 
Related topics
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Require a category for every post | 12 | 3399 | June 29, 2016 | |
| "Allow uncategorized topics" set to false should nudge users to select a category | 8 | 2560 | April 18, 2016 | |
| Users can create topic without selecting a category even when "allow uncategorized topics" unchecked | 7 | 556 | October 10, 2023 | |
| Type Before Selecting Category | 1 | 422 | November 3, 2020 | |
| "You must choose a category" not showing for Admins | 7 | 1678 | October 20, 2015 |