User can鈥檛 proceed after clicking in a host on the smart inventory host filter modal
The Select button should be enabled after clicking on a host
The Select button is disabled and the user cannot move forward

@tiagodread did this used to work and now it doesn't?
You shouldn't be able to click on the hosts in this modal. Instead of selecting hosts from a list, you create a search tag that contains the hosts you want.
https://docs.ansible.com/ansible-tower/latest/html/userguide/inventories.html#add-a-new-inventory
Therefore, to populate the Smart Host Filter field, you are specifying a tag that contains the hosts you want, not actually selecting the hosts themselves. Enter the tag in the Search field and press [Enter].
Yeah, I opened this bug wrong, I totally misunderstood the feature, i'm so sorry.
I've some considerations here:
Host Filter Key button that contains very useful information about how to perform searchI'll be opening another issue to address the items above.
Opened #8548 to address these items closing this issue