Programs and Features on old Control Panel
Apps and Features on modern Settings app
Look for Penpot Desktop in your Start Menu, right-click and choose the Uninstall option.
If the Programs and Features on the Control Panel shows up, simply double-click on Penpot Desktop, and follow on-screen instructions.
If the Apps and Feautres on the Settings app shows up, scroll down and click on Penpot Desktop, then select the Uninstall button.