The Left Panel on the platform allows you to quickly access your recently viewed test cases.
By default, the panel is open and can be closed by clicking on the icon highlighted below.
The collapsed view will be shown where you can hover over the buttons to know what they are.
You can also click on each category to collapse it if you like:
Show/Hide Panel by Default
To control if the panel appears or not after logging in, click on the arrow under your user as shown below:
2. Click Preferences
3. Click on the options Open/Close.
4. Click Save.
Refer to Dashboard Preferences for more information about the options on the menu above.