Hi supergap,
Thanks for reaching to us.
To remove / change the title that tab from the single product page. Go to Dashboard > Theme Settings > Product Page > Tabs > Clear Additional tab heading and content.
If you want to add additional tabs for specific product, you can add Tab via Product Setting https://prnt.sc/exIlSVXRC9_d
You can use Product tabs widget to display Description and Product attributes (Additional Information). Disable Reviews option. https://prnt.sc/5-S-SyfgA9FO
If you want to display custom attributes, which are separate Product > Attributes, you can create custom table via HTML Block > select via Custom Tab in Product Settings.
Navigate to Theme Settings > Shop > Single Product > Tabs. In the Additional tabs, you can remove Table title, Content to disable these https://prnt.sc/aiddjA_pEWmR
Regards,