To make Zed fonts bigger or whatever,

in file `~/.config/zed/settings.json`


```
// Zed settings
//
// For information on how to configure Zed, see the Zed
// documentation: https://zed.dev/docs/configuring-zed
//
// To see all of Zed's default settings without changing your
// custom settings, run the `open default settings` command
// from the command palette or from `Zed` application menu.
{
  "buffer_font_size": 16,
  "ui_font_size": 18,
  "autosave": "on_focus_change",
  "terminal": {
    "font_size": 16
  }
}
```