For most Architect templates, the header is a row, but some contain a fixed header with limited options. These fixed headers likely contain specific widgets, which can’t be moved or customized. By turning these into rows, you will be able to add/edit widgets.
Note: you will also need to convert a header to row if you want to create a shrinking header.
Simply locate the header and hover above to see the “Header” label.
Click here to open the content and design options and select “Convert header to a row” toggle.