Why does the assembly disappear when in-place editing a part from an assembly?
Solution
This is because you have Hide Previous Level turned on. When in-place editing a part from an assembly, the command to toggle it on/off will be on the View tab in the Show section. You can also toggle it on/off using Ctrl+Q.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 10_1809
Product: SOLID_EDGE
Application: ASSEMBLY
Version: V219.0
Function: DISPLAY
Ref: 001-7786321