Take this CSS rules to your  conf/userstyle.css  and three
elements of the template are gone:

#dokuwiki__header h1 img {
    display: none;
}
.docInfo {
    display: none;
}
 
.pageId {
    display: none;
}

On this page here, these three elements are hidden. (On small screens, like cell phones, the element  pageID  is already hidden.)

https://github.com/splitbrain/dokuwiki/pull/2487#issuecomment-426397729