Hi John,

I can reproduce the problem on my side in AutoCAD for Mac 2020 and 2021, but in 2019 version everything is fine - the contents of viewport, created from circle with linetype other then Continuous, is not visible in Layout. Looks like this is a bug in 2020 and 2021 versions. Interestingly that when I try to plot Layout with such viewport to PDF, the contents inside viewport is visible.

You can try workaround:
- create polygon with a lot of sides, say - 64.
- assign DASHED livetype to it - make sure resulting polyline has "livetype generation" enabled in polyline properties to be able to see dashes.
- create viewport from that polygon.