There are a few ways to find which extensions you have installed on Google Chrome:
- Type chrome://extensions into the omnibar (the search/URL bar at the top of Chrome) and press enter.
- Click on the three dots in the top right hand corner of Chrome, then More Tools, then Extensions.
The Extension page lists all the extensions you have installed. Now is a good time for a 'clean up' - anything that you do not recognize should be removed by clicking 'Remove'.
To add an extension explore the Chrome Web Store to find what you are looking for. Once you have found one - being careful of the source and purpose etc - such as this one: Google Meet Grid View - click on 'Add to Chrome' and then 'Add extension' in the pop-up box.