You can set this outside the game in your Game Default Settings ( <a href="https://wiki.roll20.net/Game_Settings_Page#Game_Default_Settings" rel="nofollow">https://wiki.roll20.net/Game_Settings_Page#Game_Default_Settings</a> ). Note that this only applies to future tokens . Once
this is set, launch your game, open Settings (the cog icon in the
right-hand Sidebar pane), and scroll down to the bottom. There should be
an Apply Default Settings button. Click that and choose the default
settings you wish to apply to the tokens already in your game . Click the Apply Settings button and it will go to work. It may take a few minutes depending on how big your game is - watch the progress bar below the red text and don't close or change the page until it finishes. When it is done you will get a box that says "Selected settings successfully applied." and an OK button. When you see that you should be all set.