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Linux desktop applications increase font size

QT applications

Viber

sed -i 's|^Exec=.*$|Exec=env QT_SCALE_FACTORS=1.3 /opt/viber/Viber %u|g' /usr/share/applications/viber.desktop

Viber 23.2. 2024.11.28 

sed -i 's|^Exec=.*$|Exec=env QT_SCREEN_SCALE_FACTORS=1.3 viber %u|g' /usr/share/applications/com.viber.Viber.desktop

GTK

Teams for linux: 

env GDK_DPI_SCALE=1.3 teams-for-linux %U