Allow KDE Connect through firewall


sudo firewall-cmd --zone=public --permanent --add-port=1714-1764/tcp
sudo firewall-cmd --zone=public --permanent --add-port=1714-1764/udp
sudo systemctl restart firewalld.service

UFW firewall

sudo ufw allow 1714:1764/udp
sudo ufw allow 1714:1764/tcp
sudo ufw reload

More information

How to force DPI settings in KDE

To force the fonts DPI do the following.

Open up “System Settings” and under “Font” Select “Force fonts DPI:”  Change the defualt number if needed.

Apply settings and restart the computer.

You might need to do this if KDE is displaying the fonts larger than they should be, or if the title bars are overly large.