Impossible to remove instaled samples from initialization dialogs when they were selected before, better to start samples loading on the last step of initialization

steps:
1. in UI console Step 2 of 5 check any sample for installation
2. click Next
3. click Back

result: sample bucket is marked as installed and user can't remove it during initialization( samples are loaded after the second step)

I suppose that all installation/configuration dialogs must be able to change the settings made in the previous steps

can we start samples loading on the last step of initialization(when click Next on Step 5 of 5)?