Hide all tabs on page load

make sure you have collapsible tabs checked in the settings
and check out this post for a possible solution:
https://www.ads-software.com/support/topic/close-first-tab-by-default?replies=5

didn’t not work for me, might work for you.
if you find another / working solution,
help would be much appreciated!

Thank you shipwreckgeorge. ticking the collapisble tabs in the settings has worked for me.