Hello, my experience is that currently necessary cookies in phpBB - board operation - the regulation *Cookie ending on:
* - ... _style -> sets the style ID for the user and is also relevant.
ACP, Customise tab, Style Management:
I assume the default style prosilver .... phpBB-V.3.3.12
In order to direct users to the current new style, prosilver must be deactivated once so that all users are set to the new style via a style cookie. This means that the total number of users for the new style is set / moved accordingly (the style cookie is reset). This can be recognised by the number = Used by (including spiders/robots).
Subsequently, it is mandatory to reactivate prosilver (fallback). This means that prosilver must be installed and activated.
The newly activated style (default-style) is named and displayed in the colour #536482.
General, Board settings:
If users should be allowed to select a style (UCP (ucp.php?i=179)), set style override to no.
Can someone please reproduce this. Thank you very much!
BTW: ACP, System, Spiders/Robots:
You can assign a style, such as prosilver, to the spiders/robots separately.
Removing or commenting out the copyright is unfortunately disrespectful to all developers involved.
BTW: Your page-source text shows errors.
Tip:
phpBB have long had more modern structures that should draw your attention to an update, especially in responsive browser worlds. At some point, an outdated system will catch up with you and the "damage" can mean a considerable amount of extra work for you.
In my opinion, extensions do not necessarily work in such outdated basic versions (PHP, phpBB).
And yes, there are extensions: Stylechangers
https://www.phpbb.com/customise/db/exte ... changer_2/
https://www.phpbb.com/customise/db/exte ... ick_style/
Kind regards