Setting for "Startup Tab"

**Is your feature request related to a problem? Please describe.**
I'd like to set it so that the "updates" tab shows at startup.

**Describe the solution you'd like**
Please add a setting for "startup tab" or "default tab".

ListBox:
- Explore
- Installed
- Updates

**Describe alternatives you've considered**
Using app as is.

**Additional context**
N/A