Add-ons are not reloaded by pressing the F8 key in the Preferences – Add-ons window in Blender 2.83. The add-ons reload function call with this key shot was no longer tied starting with Blender 2.80.
To bind the add-ons reloading to the F8 key shot again:
- Open the “Preferences” window
- Open the the “Keymap” section
- Expand the “Screen – Screen (Global)” branch
- Press the “Add new” button at the bottom of the list
- In the operator identifier field, type “script.reload”
- Click on the keyboard field and press F8 to bind this key to the specified operator call
- Press the “Save Preferences” button to save new settings