When adding a new SSH host inside the Network section of Dolphin, if that host is not in your 'known_hosts' file, Dolphin will ask you to accept the host's fingerprint. Except, the window that pops up is unclickable; the accept button, checkbox and cancel button are not clickable for some reason.

Steps:
1- Make sure the host you are going to connect to does not exist in your ~/.ssh/known_hosts file.
2- Open dolphin, and go in the Network section in the left pane (Under "Remote").
3- Click on Add Network Folder in the top bar
4- Select "ssh" as a server type, click Next.
5- Enter your remote information, and click Next. The popup window, for me at least, is not clickable at all. The only way to cancel out that I found is to click Cancel on the KDE Notification Toast notification.