Extend the Unity Toolbar with your own UI code. Please note that it's super hacky as the code is heavily relying on using reflection to access Unity's internal code. It might not work anymore with a new Unity update.
Add buttons to quickly access scenes, add sliders, toggles, anything.
This example code is shown in action in the gif below. Just copy the class, change it and make as many as you like. You can remove the Example folder from the project. All you need is ExtendedToolbarWindow.cs.
[InitializeOnLoad]
public class LeftButtonToolbarWindow : ExtendedToolbarWindow
{
static LeftButtonToolbarWindow()
{
RegisterToolbarWindow<LeftButtonToolbarWindow>(width:35, horizontalOffset:-90);
}
protected override void OnGUI()
{
base.OnGUI();
var buttonRect = new Rect(0, 0, position.width, position.height);
buttonRect.y = 4;
if(GUI.Button(buttonRect, "1", Styles.commandButtonStyle))
{
SceneHelper.StartScene("Assets/ToolbarExtender/Example/Scenes/Scene1.unity");
}
}
}