In macOS, a handy option called "Show suggested and recent applications in Dock" (found in System Settings ➝ Desktop & Dock) adds a divider to the right-hand side of your Mac's Dock, and after it displays any apps you recently used – or any that macOS thinks may be useful to your workflow – that aren't permanently docked.
Assuming that you have no undocked apps that are currently open, the right side of the divider shows three of the most recently used apps that have since been closed. However, there is a way to make it show more, which can be useful if your workflow involves using a lot of undocked apps consecutively.
If you're comfortable pasting commands into Terminal, it's perfectly possible to increase or decrease the number of recently opened apps that show in your Dock.
Open a Terminal window (the app can be found in /Applications/Utilities/) and paste the following at the command prompt, then press Enter:
defaults write com.apple.dock show-recents -bool true;
defaults write com.apple.dock show-recent-count -int 10;
killall Dock
Note that the -int argument defines the number of recently opened apps that you want to display in the Dock after the divider (10 in this example). You can change the number to suit, and you can revert back to showing three apps anytime by using -int 3 in the second command.
Top Rated Comments
Windows 10/11: Recommended
I always make sure to disable it on both systems.