I pressed some buttons and suddenly this wild dropdown appeared:

It’s at the top of the editing screen and I’d like to hide it again as it messes up my screen space. I only run ReSharper and I already looked at the settings there and in Visual Studio but I couldn’t find it.
Go
Tools>Options,Text Editor>C#, uncheckNavigation bar.I have one of these, but it’s only ~1 line of text tall, not ~3 lines like yours. I’ve no idea how that could have happened.