*facepalm*

I don`t use DOSBox much and sometimes when I do some testing on my second machine is good to uninstall it when I don`t use that no more there.

It comes with an uninstaller. It is in the startmenu

Sorry, now I found that, but that`s little hidden for me 😀

Make yourself a cmd file that deletes both startmenu entry and the folder you normally install to.
What do youhave in mind? The uninstall entdy in the startmenu is perhaps the easiest (lowest number of mouseclicks).
Or you just don't delete it anymore from your secondary system. Honestly I don't get it. If it's always the ssme machine you install and delete it from, why not just leave it there? Dosbox os no security threat, doesn't slow down your computer (when not running 😉) and has a small footprint...
If you use it on several machines, a dedicated USB stick might be helpful

I know, now I downloaded portable version of DOSBox from PortableApps.com, and I begin to use that from pendrive 😀 But I don`t see that option for years and I deleting program group, folder and shortcut all that time each time 🤣

PortableApps... *facepalm*

Reason why: you could have just copied dosbox from your primary machine. Dosbox is portable to begin with...