I am very much use IntelliSence of VS2010. Sometimes, I can not tell when and why, the IntelliSence changes.
Example: Label lblTestTest
The normal behavoir is: I
In VS2017, for C++ at least, go to
Tools/Options/Text Editor/C/C++/Advanced/IntelliSense
and change Member List Commit Aggressive to True
Member List Commit Aggressive
True
Also you can use TAB instead of Enter.