Display Modes and Resolutions Find missing modes, choose output resolutions and manage favorite display modes. Explore subtopics Separate articles that explore this topic in more detail. My monitor used to offer 4K but now only offers 1080p. Do I need BetterDisplay Pro?Start by restoring the display mode that previously worked in macOS. Why does toggling HiDPI change my desktop size?The HiDPI switch chooses an available display mode with the opposite HiDPI setting. Can I send a 640 × 480 signal to a CRT when the desktop menu will not offer it?On a supported Apple-silicon connection, a low-level connection-mode switch can select an available 640 × 480 signal even when normal desktop selection will not use that size. How can I send a lower-resolution signal instead of a scaled desktop?Select a display mode that changes the actual output timing, then verify the incoming resolution in the monitor’s own information menu. How do I save a favorite resolution without right-clicking?Select the display mode you want, open Manage… beside Favorite modes, and click one of the five numbered slots. Why is a resolution missing from the slider or Display Mode list?The slider and Display Mode menu filter the modes macOS provides. How can I keep the resolution slider within a useful range?Open Settings > Displays > [display] > Additional Settings… and enable Limit resolution slider and keyboard shortcut range. Why does the resolution not change when I enable Picture by Picture on my monitor?A monitor's hardware Picture by Picture mode does not always tell macOS that each input now occupies a smaller part of the panel. Why can I still change the resolution when Configuration Protection is enabled?Configuration Protection allows deliberate changes made in BetterDisplay.