The poco rit. in bars 42-43 sounds like it needs a little more time. To achieve that, you can reduce its final tempo.
Prerequisite
Tempo
is active at the top of the track overview.
Procedure
Result
The final tempo of the poco rit. is changed.
Tip
You can also change the final tempo of gradual tempo changes in Write mode by using the Final tempo % property in the Tempo group of the Properties panel. When you change the final tempo of gradual tempo changes in the Tempo track, Dorico calculates the corresponding percentage change.
After Completing This Task
Click in the ruler in the Key Editor or track overview anywhere in bar 41 to move the playhead there, then press Space or Enter to start playback and hear the effect this has on the tempo.