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Kvantum themes on Flatpaks are set to KvantumAlt instead of the selected theme.

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    #1

    [SOLVED] Kvantum themes on Flatpaks are set to KvantumAlt instead of the selected theme.

    I have the Kvantum Flatpak downloaded.




    On the left is a native program and on the right is a flatpak.


    Anyone know what could be causing this?


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  • Answer selected by Snowhog at Feb 01, 2026, 11:51 AM.
    I fixed it by running this command:
    flatpak override --user --env=QT_STYLE_OVERRIDE=kvantum --filesystem=xdg-config/Kvantum:ro​
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      #2
      You might need to ask the Kvantum folks on this one.
      You do have kvantum installed natively as well? I know it used to be necessary even with the flatpak, No idea if this is still the case. You also may need to make sure the themes are in the correct place.

      The problem is, the third-party Kvantum has really poor docs. Or barely any.


      Also, in this screenshot, Kdenlive does have its own appearance settings, so it may be worth checking that it is set to 'default' just in case it is set to something else.


      Last edited by claydoh; Jan 30, 2026, 06:05 PM.
      Self-built: Asus PRIME B550M-K/Ryzen 5600GT/32Gb/Intel ARC B580 12Gb/KDE neon
      HP Elitedesk 800 G3 Mini: i5-7500T(35w)/32Gb/KDE Linux/Kubuntu LTS
      HP Chromebook 14: i5-1135G7/8Gb/512Gb SSD/KDE neon​
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        #3
        This effects all flatpaks, not just kdenlive.
        And yes I have kvantum installed natively aswell.
        I'll go ask the kvantum people.
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          #4
          I fixed it by running this command:
          flatpak override --user --env=QT_STYLE_OVERRIDE=kvantum --filesystem=xdg-config/Kvantum:ro​
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