I have the Italian version and I am not sure about the English names of the menus.

I reinstalled Inkscape with the msi package found on the official site but it keeps showing this when I select the Text tool!
I have no idea why it is listed as custom, I just removed the languages.
On the other programs the fonts work perfectly.
Active Package it is blank.

Inkscape 1.3.2 (091e20e, 2023-11-25, custom)

    GLib version:     2.78.1
    GTK version:      3.24.39
    glibmm version:   2.66.6
    gtkmm version:    3.24.8
    libxml2 version:  2.11.5
    libxslt version:  1.1.38
    Cairo version:    1.18.0
    Pango version:    1.50.14
    HarfBuzz version: 8.2.2

    OS version:       Windows 10 22H2

img: https://i.imgur.com/drgdCsA.png

All Windows versions is currently detected as custom (tested on Win 11).

Just change the font when you are done typing (sans-serif is never installed).
 

Question: Why is it listed if it is not installed? Shouldn't only installed characters be listed?
Problem: Even if it would work to change the character at the end of typing, I don't see as I type the result. But I don't think that's what you meant.

True, I notice today that sans serif is strikethrough.

[url=https://postimg.cc/PP6mbZ2s][img]https://i.postimg.cc/PP6mbZ2s/ink1.png[/img][/url]

I have tried using other font, with this result.
In the case of the third text, I started in Verdana and then changed to Stencil.

[url=https://postimg.cc/bsYx2L09][img]https://i.postimg.cc/bsYx2L09/ink2.png[/img][/url]

However, I restored the basic settings and it took to writing correctly.

AP2014

Question: Why is it listed if it is not installed? Shouldn't only installed characters be listed?

Good question. Maybe generic font families will be presented differently in a later version?
https://gitlab.com/inkscape/inkscape/-/issues/5176

https://www.w3schools.com/css/css_font.asp
https://developer.mozilla.org/en-US/docs/Web/CSS/font-family#generic-name