Let's say there is a Tabs (Nestable) element on "Sample Page" whose frontend URL is:
By default, the first tab will be the open/active one.
Now you want the 2nd tab to be open on page load. Just append that tab's slug as the value of a
tab query string.
The user can click on any other tabs to switch to them as usual.
Edit your Page/Template with Bricks.
At Settings (gear icon) → PAGE SETTINGS → CUSTOM CODE → Body (footer) scripts paste:
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