Only 2 and a half beats in the last measure

Why does Dorico end my piece which is in 3/4 time with a measure that has 2 and a half beats? How do I get a quarter rest on beat 3 in the last measure. see the screen shot

Most plausible explanation is that you inadvertently placed the end repeat barline in the wrong place (not on a bar boundary), and maybe subsequently trimmed the flow? We only see a tiny fragment, so we don’t know what’s going on elsewhere when it comes to time signatures etc.
It’s easy to repair anyway: select the last eighth rest, then type Shift-B+1eEnter. This will add one eighth to the last bar.

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Or just delete and replace that end-repeat barline.
Deleting it will restore the correct bar length.

That did the trick. Thank You!