Have keyboard option that does not show bass clef

There is a Layout panel that was formely called "Instruments". You can summon it with F7. There you can hide a stave (click on the eye icon) or delete it (choose a stave and click on the trash icon).
https://handbook.musescore.org/notation/instruments-staves-and-systems/…
https://handbook.musescore.org/notation/instruments-staves-and-systems/…

Method 1: Create a new Score. Click on Choose Instruments / Keyboard and select a Piano to add to the score. Go to the Layout panel (Instruments panel before v.4.5; yellow highlight). Click the arrow to the left of the instrument name (green highlight). This now displays the two staves--the treble and bass clef. Click on the bass clef (blue highlight) to select it and, near the upper right of the Layout panel, click the 'trash can' button (orange highlight) to delete it.

Method 2: Create a new Score, Select any single staff instrument (i.e. none of the keyboard instruments and neither harp nor marimba ... are there any other two-stave instruments I've left out?). Right-click on the stave and, from the context menu that appears, click on Staff/Part properties... (first screenshot below). On the Staff/Part properties dialog, under Part properties, click the Replace Instrument button (yellow highlight in second screenshot below) change the Instrument from whatever you selected to "Piano".

Method 3: Create a new Score. Click on Create from Template (yellow highlight) / General (green highlight) and select the "Treble Clef" (blue highlight)

I recommend that every new (or "new-ish" :-) user take an hour or two and simply read the entire Handbook (https://handbook.musescore.org/). Don't try to memorize it! Just skim through it and familiarize yourself with the contents! But read it all!!! Then you'll have an idea where to find things when issues come up in the future. "Didn't I see something about that in the Handbook?"

Welcome aboard and best of luck!!!