Right-click the desktop > Display settings > Scale. Set to 125% or 150%. qBittorrent will respect this. Caveat: This scales everything—icons, padding, and fonts—which can lead to blurriness on some older versions.
This is a brute-force method. Effective, but inelegant. The first real control lies in a plain-text file you've probably never opened. On Windows, it's in %APPDATA%\qBittorrent\qBittorrent.conf ; on Linux, ~/.config/qBittorrent/qBittorrent.conf ; on macOS, ~/Library/Application Support/qBittorrent/qBittorrent.conf . qbittorrent increase font size
Launch via terminal with an environmental variable: Right-click the desktop > Display settings > Scale
Open qBittorrent > Tools > Preferences > Behavior. At the bottom, check "Use custom UI Theme" and browse to your style.qss . Right-click the desktop >