Is it possible to update every token setting in a game to the game's default token setting?

I have recently found myself changing the default token setting in my roll20 game. The old tokens as well as the tokens saved to their sheet has not changed with it (as intended i guess).

Is there a fast way to update every single token's setting in the game to the new default, or do i have to preform it manually?

It depends on what character sheet you are using for your game, and what specific setting you want to update.  But if it's a setting that is available for you to change and update to all tokens, it'll be listed on the Game Settings page (outside of the game, click on Settings, then Game Settings). Look for the Game Default Settings and Default Sheet Settings. 

After changing those settings, go into your game and click on the settings tab and under Experimental Features you should see "Apply Default Settings".

If you want to update the whisper settings, I'll cut and paste from keithcurtis' great explanation as well:

A guide to whisper settings:

Note that the whisper settings are attached to each individual sheet, there is no actual game setting. These instructions are for changing the defaults for all the character sheets in the game, then applying the settings to all existing sheets. Note that this will also change your PC sheets - you will have to manually change them to a different setting if one is preferred.

Here are the ways to toggle this behavior:

Always Whisper

1. Go to the Campaign Settings Page
2. Choose "Always Whisper Rolls" under "WHISPER ROLLS TO GM" in the Default Sheet Settings
3. Save
4. Load your game
5. Go to the settings tab on the right and scroll to the bottom where you will find a button that says Apply Default Settings. Press it.
6. Choose to update the Whisper settings. Wait a minute or two for it to resolve. There is a thin easy-to-miss progress bar.

Never Whisper

There's a bug in the game settings that doesn't recognize "Never Whisper Rolls", possibly because it is trying to write a blank value. The solution is to use Whisper Toggle. The default is public, so once this is set, all rolls should show.

1. Go to the Campaign Settings Page
2. Choose "Whisper Toggle" under "WHISPER ROLLS TO GM" in the Default Sheet Settings
3. Save
4. Load your game
5. Go to the settings tab on the right and scroll to the bottom where you will find a button that says Apply Default Settings. Press it.
6. Choose to update the Whisper settings. Wait a minute or two for it to resolve. There is a thin easy-to-miss progress bar.

Query Whisper

The default is public, so once this is set, all rolls should show by default unless you choose otherwise.

1. Go to the Campaign Settings Page
2. Choose "Query Whisper" under "WHISPER ROLLS TO GM" in the Default Sheet Settings
3. Save
4. Load your game
5. Go to the settings tab on the right and scroll to the bottom where you will find a button that says Apply Default Settings. Press it.
6. Choose to update the Whisper settings. Wait a minute or two for it to resolve. There is a thin easy-to-miss progress bar.

Have fun!

Thank you very much!!! Apply Default Setting is the exact thing i was looking for