I have more than 100 QLR files, QGIS does not allow me to select multiple and, adding them one by one takes a long time. How can I add them all at once?
I can select and drag multiple .qlr files from my operating system file browser onto the QGIS window and the layers appear.
I can select multiple .qlr files in the QGIS "Browser" section, right-click, and add them to the project.
It only seems to be the "Add Layer Definition File" that is set to only allow one file to be selected. I wonder if that might be worth a bug report as a possible enhancement to the QGIS bug tracker?