Parts (frames) are not shown in the Drawing View.
Reviewing the Drawing View Properties show all parts are grayed out:
How to find an option or setting to allow the parts to be "enabled"?
Solution
Since this drawing was created in a previous Solid Edge version, we tried a "forced Update (CTRL + SHIFT + "Update Views") which then resolved the issue.
All parts (frames) appeared in Drawing View automatically, and were selectable in Parts List afterwards.
Notes and References
IR#9688674
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: SOLID_EDGE
Application: DRAFT
Version: V220.0
Function: DRAWING_VIEWS
Ref: 002-8017270