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Hi, I try to reproduce the issue, but I couldn't. Could you please provide versions of cockpit, cockpit-machines and libvirt-dbus? And if you can reproduce, could you please try to click "Expand" and try to click "Continue" again? Then see if the installation could be continued.

$ rpm -qa|grep cockpit 
cockpit-238.2-1.el8.x86_64

$ rpm -qa|grep cockpit-machines
cockpit-machines-238.2-1.el8.noarch

$ rpm -qa|grep libvirt-dbus
libvirt-dbus-1.3.0-2.module+el8.3.0+6423+e4cb6418.x86_64

This issue can reproduce 100% in my side. 
It can be continued if click "Expand".

So if clicking "Expand" can continue the process, it should be probably the same as this issue: https://bugzilla.redhat.com/show_bug.cgi?id=1913548. And I guess your display resolution is less than "2560*1440", this issue seems to happen in which resolution is "1920*1080" or less

# xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384

My display resolution is 1920*1080.

This bug may have something in common with Bug 1913548 , paste here for reference.

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.