For a while now, I've been asking about "Updates" to the Themis template 'Overrides' (and PHP 8.2)..
Joomla is currently on 4.3.4 and still NO Updated Themis template from that J4.0 from 2021 (your last update)..
There are lots of outdated Overrides that were done in Joomla 3.x (your Demo is still J3) and need to be thoroughly "Checked and Updated" (also from Helix Ultimate -> Themis Overrides).
There's quite a few of these Overrides in this Template; I need them updated IMMEDIATELY, please!!
Thank you!!
Joomla 4.3.4
Helix Ult 2.0.14
SP Builder 3.8.10