The Inspector panel provides great opportunities for customizing the block. You can hide/show the Inspector panel by clicking on the button with the gear icon, top right. Or using hotkeys ⇧+⌘+, for Mac, and ⇧+⌃+, for Windows and Linux.
The name of HTML anchor. Anchors lets you link directly to a section on a page.
Additional CSS Class
Adds an extra class to the block wrapper. You can also use the inster-grid class for additional styling of the Inster Grid block.
Other block settings panel: