The Heading Instrument’s compass rose is a bit too large for its display box…
Here I have set my desired heading to around 135 degrees and we can see the orange triangle on the graphic just fine.
But, If I set the desired heading to 120 degrees the triangle begins to “disappear” on the right side of the graphic:
At 90 degrees, it is entirely hidden. Probably the compass rose there should be a bit smaller diameter?