A few times this calendar year, the menus in a newly-opened Developer Console are not responsive to mouse clicks. Nothing happens.
The IDE workspace has become corrupted. Here is how you can quickly resolve it:
- Go to Salesforce Workbench
- Go to the REST Explorer and enter this GET query:
- Copy to the clipboard the value of the ID field in the Raw Response result
- Do a REST Delete that looks like:
Close and reopen the Developer Console and you should be good to go.