Is the 5 under the note a Tuplet?

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I want to make the number 5 under the note into a 4, so I deleted the note,
but it doesn’t change to a 4.

How can I change it to a 4?

When I make a 4, it turns out completely different.

According to what we can see on your screenshot (including what looks like a quarter rest above), your group of 5 notes is indeed a quintuplet, i.e 5 16ths instead of 4.
Are you then sure that you want four 16th notes with a “4” tuplet sign? A group of four 16th would be here normal and therefore shouldn’t need any tuplet mark. However, what you wish is doable.

It’s common to write 5:4 as 5 for brevity. Yes, it is a tuplet. Very normal.

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Just to add to the previous responses: what you have in the middle image in your OP is 5:4 sixteenths, where the last is a silence (rest):

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Your later rhythm would — assuming that the tuplet is still based on a sixteenth note — indicate 4 sixteenths in the space of 4, then the sixteenth rest would initiate beat 2 (assuming the quarter note = the beat):

Maybe you’d prefer the look if it included a bracket:

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The bracket makes it easier for a musician to read. Is it possible to add that?

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Absolutely! (I made that example in Dorico.)

For me it is the result of my default Engraving Options > Tuplets settings, but one can easily tweak individual instances in the Properties Panel in Engrave Mode.

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