I found a question very similar to my problem: How to link dataframes in ArcGIS or QGIS?. But the solution for QGIS doesn't work now (Dual View plug-in is not available anymore).
I want to sync three views:
The idea is to move the three map views at the same time with a master map in QGIS print composer.
Is there a way or plug-in to do this?
Answer
Another elegant "no code" solution for the synchronization of composer maps uses the built-in "Overview" mechanism of QGIS:
Therefor we add a "Master Map Frame" overview to every map window, that should be synchronized with the master map. Then we set frame style to No Brush/ No Pen and enable "Center on overview".
To fix the scale of the child map, we enter an Expression value: 
That's all.
Very easy and very dynamic!
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