Double time signature in MuseScore

There is some music where you want the time signature is alternating, for example 4/4 in every odd measure and 2/4 in every even measure.
In that case we usually would like to show the following time signature:

There is no native support in MuseScore for that, but easily can emulate that.

A favourite MuseScore feature: frames

There is a certain feature which made my switch to MuseScore easier: frames. In LilyPond I think it would have been way hard to do something like this, but even if not, MuseScore did it very easily.
The point in vertical and horizontal frames is that they behave as measures, so you can freely insert them into a staff, and then they separate systems or bars.
Best if you see them in action:

(Excerpt from Csaba Vedres: Consolatio)

 In this fragment frames are used to insert composer's instructions between systems and to make a line shorter. Let's see some other examples:

Remove the first time signature in MuseScore

If you try to delete the first time signature, by selecting and pressing Delete, you get an error message: "The first time signature of a piece cannot be removed". You might try to hide it, but it would be ugly:

But if you add an empty measure at the beginning, then delete that, you can achieve the following:

 See a small animation that shows how to do this: