I'll go back to your instructions.
Go to, again, K > Applications > System > Muon Package Manager and this time Right-Click on it and Add to Favorites: the Favorites are the apps listed by simply clicking the K button, very convenient. You can remove Muon Package Manager from the Favorites by right-clicking it (in the Favorites list) and selecting Remove from Favorites and it will still be found, as before, here: K > Applications > System > Package Manager--Muon Package Manager.
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