How can I remove the Reviews tab on product pages?

Hi,

Set the "Choose which module you want to enable" setting of the Votes section of the HikaShop configuration to "nothing" and the tab should be removed from the product page.
Otherwise, you can directly edit the file "show_tabular" via the menu Display>Views and change the line:
$status_vote = $config->get('enable_status_vote');
to:
$status_vote = false;