Setting more than 4 max items for Dashboards to show

Hi all, I’m running an Intel Nuc with Proxmox and installed a container debian based and in it installed Grafana, I can’t save in the max item a value higher than 4, I have no Save button and don’t know how to save this value maybe I must edit an internal file via command shell of the container? Can someone tip me on how to do it?
I’m referring to the 4 value in the field max items, as the image I link below