Go to the Library tab in the top menu and find the game you want to delete. Click on the game with the right mouse button (or with the left mouse button + the CONTROL key). Select “Delete Content” in the menu that appears. Confirm your action by clicking “Delete.”. Wait for the uninstall process to complete. How to clear Steam's cache on your PC or Mac to make the gaming app run more efficiently. How to delete your Steam account permanently, which will erase all of your games and account. Apr 17, 2019 Step 3: Locate and right-click the game you want to uninstall in your library, which should open a drop-down menu. On that drop-down, click “uninstall.” Step 4: Steam will confirm with you whether you want to completely delete the game. When you are ready, click the “delete” button. The game will now be uninstalled.
By William Gallagher
Tuesday, September 03, 2019, 12:33 pm PT (03:33 pm ET)
Steam will work fine on macOS Catalina, you just need to take some steps first
You'll have to ask Valve why they can't always update your 32-bit Steam client app to the 64-bit version that will run under macOS Catalina. But, AppleInsider is repeatedly being asked by users why their install is yelling at them that it needs an update.
The update from Valve is ready, and the Steam client will work just fine under macOS Catalina —you just may have to prepare the ground a little.
Specifically, the problem is with the Steam client on your Mac. Even if you have shortcuts to your favorite games, they all launch through that Mac app, and it's possible that your copy of that is still a 32-bit app.
If you're stuck with that 32-bit version, you have to manually get rid of it and then reinstall a new copy.
Oh, yes, it is. The Steam service is fine and so are at least most of your games. It's just the Steam client you have to fix.
Trash talk
One quick tip: do be certain to have your Steam account name and password to hand. You clicked that Remember Me button years ago, but this is going to appear to Steam as if you're setting up a new computer.

When you're sure you have the account details, start with this:
- Quit Steam
- Go to your Applications folder
- Drag Steam out to the Trash
If you have Hazel installed on your Mac, it will spot that you've removed an application and will offer to also delete all of that app's supporting files. As good as that is, as so much handier it is than going through the whole process of deleting them manually, don't let Hazel do it.

That's because Hazel will do too good a job and it'll remove everything. We want rid of a lot of Steam, but not the bit that includes your games.
If you have Hazel on your Mac, it will offer to delete Steam's supporting files. But you need the ones to do with your installed games, so click Keep All.
So next, you find all of Steam's supporting files from the Finder.
Hold

Hold down Command and Shift, then press the letter G to call up this Go To Folder dialog. You're going to get very familiar with it.
In the folder that opens, scroll to find the Steam folder, and delete everything in there except /steamapps. That directory is where your games live, and keeping that folder preserves the installs.
Next, repeat that Go to Folder with each of the following. In every one, look for Steam or Valve files.
- ~/Library/Caches/
- ~/Library/Logs/
- ~/Library/Preferences/
- ~/Library/Cookies/
- ~/Library/Saved Application State/
- ~/Library/LaunchAgents/
Do be careful to solely select Steam or Valve folders, but then drag them to the Trash and empty it.
Almost done
Now go to store.steampowered.com where you'll see an Install Steam