...
Click the + sign next to Standard and select Manage Configuration Extensions.
Uncheck the Check applicability when adding and loading the extensions option. Click Add, which will open a browse dialog where you should select the path where the extension file is saved.
Once the file is selected, you will receive a confirmation message. Press Yes and then repeat the action.
If the extension does not appear in the table, start again by clicking Add. Make sure to uncheck Safe Mode, Profile Name, and Unsafe Operation Protection
System will give a Security Warning message > select Yes.
Then restart the application.
2. Designer mode:Anchor designermode designermode
...