There is since several (!) updates an error in InDesign which is really stupid!

If you split the document into two windows (with the button on the right bottom) you should be able having two contents of a document. This worked for years without any problem. Bust since several version this function makes only nonsense!
We produce a lot of user guides in several languages (usually 3-4, sometimes up to 12 languages). For checking them we open as described the split screen. on the left side we use the main language (for ex. German), on the right side we have for example French (see screen shot 17.16.07. png).
And now the problem: if I copy for example a warning symbol from the German version (= left side) to the French version (= right) the left side of the screen "jumps" as well to the same page in French (= same content as on the right side; see screen shot 17.16.27. png). This is an idiotically error which makes no sense. It happens as well in the other direction.
As I said before: it worked for years perfect but for about one year not anymore.
PLEASE CORRECT THIS ERROR ASAP. It cost me hours and hours to change the sides all time :((