You can take the hint as Microsoft has abandoned Movie Maker, and if you have decided to stop using it and looking for best alternative of Windows Movie Maker, then there are bunch of them like Clipchamp, but OpenShot tops all of them in features and user interface which you can download from openshot.org.
It supports a wide range of video, audio and image formats, each of which are organized and edited
using a familiar multi-layer timeline (see screenshot). You can trim and position them as required, as well as scale, rotate and change their speed, before inserting transitions. A lot of the skills you’d learn using OpenShot can be applied elsewhere should you switch to another tool.