First, I offer my apologies for only appearing today.
I followed all the instructions they gave me, but without favorable results.
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I rebuilt the font cache.
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I checked the log and error messages.
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From EOS Welcome, I set the theme Xfce no customized.
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I installed qt5ct, qt6ct and kvantum and made the corresponding modifications to the QT_QPA_PLATFORMTHEME and QT_STYLE_OVERRIDE lines of the /etc/environment file
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I installed VLC and verified that the changes made with kvantum did indeed take effect, but ONLY in this player. EOS Quickstart Installer and Discovery show no changes.
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Finally, I did additional testing with clean installs of EOS LXQt and Plasma, but the Discovery and EOS Quickstart Installer issue persists on them as well, when run on the old laptop.
In conclusion, the failure is associated with the HW and not the SW, since the problem does not occur on other computers and the tests were always done with EOS newly installed, without changes to the default settings. Since this project aims to ensure that EOS installed on an external SSD can be run on any computer, and considering that the installation of apps can be done without problems with pamac-manager and from the terminal, I think that EOS Quickstart Installer and Discovery are completely dispensable.
I very much appreciate the help you provided me. Thank you very much to all.