To expand a specific collapsed code block, click the plus (+) sign to the left of the code block. For more information, see Code Editor Context Menu. Using the Code Editor context menu command Fold, you can collapse specific categories of code blocks: that is, regions, XML DOC comments, and so on.

Right-click the Code Editor and select Fold > Nearest.To collapse the nearest code block, you can: To collapse a specific code block, click the minus (-) sign to the left of the code block. Use the Code Editor Context Menu entries Fold/Unfold (see below).Click the minus or plus sign (-/+) to the left of a specific block.You can collapse or expand code blocks in the following ways: If the code folding feature is disabled, then any collapsed code block is expanded and can no longer be collapsed (until code folding is enabled). To enable and disable code folding for the current edit session, press and hold Ctrl+Shift K+O.To enable and disable code folding for the current session and subsequent sessions, use the Code Folding option on the Tools > Options > Editor Options dialog box.

Visual studio code collapse all folds