The dropdown button in the Module Details Panel for CPU Usage Module disappears on switching to Hierarchy or Raw Hierarchy View. If data is profiled then the button reappears but on clearing results it disappears again.
Refer to the attached video.

Steps to Reproduce:
1. Create a New Project
2. Window > Analysis > Profiler
3. CPU Usage Module > Details Panel > Dropdown > Hierarchy/Raw Hierarchy (if not already in that view)
4. If already in Hierarchy view, Enter Playmode switch to Timeline
5. Clear results and switch back to Hierarchy

Actual Result:
Dropdown button disappears on switching to Hierarchy/Raw Hierarchy

Expected Result:
Dropdown button remains visible and the View switches accordingly

Occcurring on:
2020.2.0a1, 2020.1.0a26, 2020.1.0a11

Working Fine on:
2020.1.0a10, 2019.3.4f1

Environment:
Windows 10 and macOS 10.14, 10.15

Workaround:
Profile some frames or select a valid frame and the drop-down reappears.