How do you configure insert-mode completion behavior?
set completeopt=menu,menuone,noselect
Configure completeopt to control the completion popup: menu shows popup, menuone shows even for single match, noselect doesn't auto-select.
set completeopt=menu,menuone,noselect
Configure completeopt to control the completion popup: menu shows popup, menuone shows even for single match, noselect doesn't auto-select.