You can download it on the JetBrains plugin page.
A plugin for JetBrains IDEs which adds option to disable auto-popup completions on a space to leave your already typed text as you intended.
Configure it in Editor > General > Code Completion settings (Preferences on OS X). Disable for all languages or only for languages in a configurable list.
If you want to insert a suggestion for space disabled auto-pop then either use TAB or ENTER or manually change the selected suggestion before using SPACE to insert it.
Prompted by delayed auto-popup completions in Kotlin after typing
followed by a space, inserting some random function, triggering a severe bout of Tourette's as a
IDE versions 2019.3 added