1. When an HTML element on your page has display: grid or display: inline-grid applied to it, you can see a grid badge next to it in the Elements panel.
2. Clicking the badge to toggle the display of a grid overlay on the page. The overlay appears over the element, laid out like a grid to show the position of its grid lines and tracks.
3. Open the Layout pane. When grids are included on a page, the Layout pane includes a Grid section containing a number of options for viewing those grids^[1]

[1] "Inspect CSS Grid" - Chrome Developers