Select a Glyph Ranges for your language in Help-Settings-Font, you may want to select a custom font if you don't like the embeded one.

Add force-window and idle=yes to your mpv.conf.

portable_config is also supported on windows.

ImPlay uses it's own config dir for libmpv by default. To use mpvs config dir, enable Use mpv's config dir on Help-Settings, it will take effect after restart.

To make the context menu and command palette work, add the following lines to your mpv's input.conf:

MBTN_RIGHT   script-message-to implay context-menu    # show context menu
Ctrl+Shift+p script-message-to implay command-palette # show command palette

mpv related options changed in context menu won't be saved by ImPlay, you need to change mpv.conf to persist it. For example, add no-border to mpv.conf will disable window border.

Visit Manual to discover more options that can be used in mpv.conf.

Change mpv's input.conf (Manual), you can find the input.conf that ImPlay used via Tools - Open Config Dir.

Remove the MBTN_RIGHT script-message-to implay context-menu line in input.conf.

Update the Ctrl+Shift+p script-message-to implay command-palette (or Meta+Shift+p on macOS) line in input.conf.

Add auto-window-resize=no to mpv.conf.

Add video-sync=display-resample and override-display-fps=60 to mpv.conf (change 60 to your monitor's refresh rate).

NOTE: override-display-fps is renamed to display-fps-override in mpv 0.37.0