Default font now showing some characters in Discord

I’ve just installed OpenSUSE Leap 15.1 on my laptop, and everything is working very nicely. The only problem I have is that the default font for Leap 15.1 does not include all UTF-8 characters (I presume it is UTF-8 encoded) that Discord uses. Which font should I install that includes the same characters as the default font on Windows 10 Pro does?

What command would I use to install the font?

Thank you for your help.

Is that in the CLI? When not, please explain which desktop you use.

In both cases explain in which program/application.

Discord is the name of the application.

https://discordapp.com/

and I’m using KDE.

You’ll have to be specific, Discordapp can be installed as its own application or it can be run in a web browser.
If in a web browser, you’ll then have to be specific which browser (and version, or that it’s on a fully updated system so we can know the browser also is latest, current).

TSU

Discord is running as an Electron app on OpenSUSE and not in the browser. Having said that I have just tested it out in Firefox and the symbols are showing correctly there, so it appears to be a problem with the Discord app itself which is weird.

I’m using Firefox 68.4.1esr.