In the Big Sur beta, when the timer is active and seconds are displayed, the width of the item changes each second depending on the width of the digits.
The app does try to specify a monospace-digits font, and this worked in pre-Big Sur versions of macOS, so apparently something has changed at the OS level.
In the Big Sur beta, when the timer is active and seconds are displayed, the width of the item changes each second depending on the width of the digits.
The app does try to specify a monospace-digits font, and this worked in pre-Big Sur versions of macOS, so apparently something has changed at the OS level.