You can fold sequences of two or more empty lines (may contain whitespace) with these settings:

:syn match MyEmptyLines "\(^\s*\n\)\+" fold
:syn sync fromstart
:setlocal foldmethod=syntax

After entering the above, type zM to close all folds, or zR to open them.

If you have set 'foldcolumn' to more than 0 you can open/close the empty-line blocks by clicking the '+' or '-' with the mouse in the folder column.

See also

• Remove unwanted empty lines to delete blank lines

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