No Way to Shrink UI Fonts in Brave on Kubuntu 25.04 (KDE Plasma 6 + Wayland)

Description

Brave’s UI fonts (tab labels, menus, settings) are excessively large on Kubuntu 25.04 running KDE Plasma 6.4.5 with Wayland. There is currently no reliable way to reduce UI font size without affecting the entire desktop or introducing rendering glitches.

Steps to reproduce

1. Launch Brave using --ozone-platform=wayland

2. Observe oversized UI fonts compared to other KDE apps

3. Attempt to shrink UI fonts using:

--force-device-scale-factor=0.9 → causes window bleed across monitors

Fontconfig overrides (FONTCONFIG_PATH) → no effect

KDE font settings → affects all apps, not Brave-only

GTK/GDK environment variables → ignored

Flatpak version → same behavior

Actual result

UI fonts remain large and unresponsive to all known scaling methods under Wayland. --force-device-scale-factor causes visual glitches in multi-monitor setups.

Expected result

Brave should respect system font scaling or provide a way to adjust UI font size independently of global DPI or device scale.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

OS: Kubuntu 25.04

Desktop: KDE Plasma 6.4.5

Session: Wayland

Brave Version: 1.82.170

Chromium Version: 140.0.7339.186

Display Setup: Dual monitors

Resolution: 1920×1080 px @ 100 Hz

Physical size: 527×296 mm (23.8 inches)

Pixel density: ~92.57 PPI (low-DPI)

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response