Could you post a screen shot?
"+" and "-" are for outlining. Right click in the left margin for the context menu to choose Outline options.
When you first open a file with default settings, I would expect to see "-" icons, those indicate blocks that can be collapsed. "+" icons indicate blocks that can be expanded, but unless you have modified your language options nothing should be automatically collapsed.
Unless, you have gone to Document > [lang] Options... > View > Selective Display, and checked either "Hide documentation comments on open" or "Hide other comments on open". These options will automatically collapse multi-line comments.