wezterm/docs/config/lua/keyassignment/ResetFontAndWindowSize.md

ResetFontAndWindowSize

Since: nightly builds only

Reset both the font size and the terminal dimensions for the current window to the values specified by your font, initial_rows, and initial_cols configuration.

local wezterm = require 'wezterm';
return {
  keys = {
    {key="0", mods="CTRL", action="ResetFontAndWindowSize"},
  }
}