On my Windows 10 Pro, version 1909 (18363.1198), there is no listing in Apps & Features for Flash Player and at the Adobe website at Flash Player Help for testing to see if it is installed, it says “FP is either not installed or not enabled.”
However, I do have files and folders in four major locations: in C:\Windows\system32\Macromed\Flash, in C:\Windows\SysWOW64\Macromed\Flash, in %appdata%\Adobe\Flash Player, and in %appdata%\Macromedia\Flash Player. These folders are mentioned at Uninstall Flash Player | Windows.
Should I delete those files and folders?