How to convert the two tied quavers into one crotchet? (over the beat)

At the E-minor half-diminished (Emin7b5) chord rhythmic slash, I am simply trying to convert the two tied quavers into one crotchet, while everything else remains the same.

Can someone please share their wisdom and/or a solution.

(This might seem like Dorico 101 for most of you but I just can’t seem to solve this.
I looked into beaming options but without success).

Turn on Force Duration (O) and then enter the quarter note.

ahhhhh…thanks Dan!!! :wink::wink: