Sagemaker Studio - Launcher tab is not opening

I would recommend you to take a look at below options: You can open Studio Launcher in any of the following ways:

Choose Amazon SageMaker Studio at the top left of the Studio interface.

Use the keyboard shortcut Ctrl + Shift + L.

From the Studio menu, choose File and then choose New Launcher.

If the SageMaker file browser is open, choose the plus (+) sign in the Studio file browser menu.

In the Quick actions section of the Home tab, choose Open Launcher. The Launcher opens in a new tab. The Quick actions section is visible by default but can be toggled off. Choose Customize Layout to turn this section back on.