@cagatay this relates to a change the css classes used for the brand header meaning it will now float to the left instead of right.
If you’d like to retain the original behavior, you can add this css class
[data-widget-area="brand-header"] { justify-content: end; display: flex; }Further information here
https://community.nodebb.org/topic/17090/manual-build-a-custom-header-in-harmony/19?_=1684069325296