Sheet tabs missing in Draft file.
Solution
Go to Application button -> Settings -> Options and go to the View page. In the top left corner under Window, there is a checkbox for Sheet tabs. Make sure this is checked.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 10-1809
Product: SOLID_EDGE
Application: DRAFT
Version: V220MP3
Function: SHEETS
Ref: 001-10256140