OK Button Long Press No Longer Working

[darwindesign]

This is entirely by design. When you plug in a dongle for an OSMC remote (or you have a Vero V which has a dongle inside it) Kodi loads up a special keymap that has been highly tuned to this particular remote. This keymap can be disabled entirely, or alternatively, one can add in additional keymaps to further tune the controls to their preference. You can find out more in the following guide…

OSMC Remote - Long Press Keymap Guide

Introduction This guide is intended to serve as a reference for users who want to modify the button behavior of their OSMC remote controls. This is not intended as a general guide on key mapping in Kodi, or a thread for general keymap questions. If you need to familiarize yourself with keymaps, or what things you can do with them your first step should be Kodi’s wiki on the subject. OSMC Legacy Behaviour The first two generations of the OSMC remote using OSMC prior to the March 2020 update …

In your case the keymap you would add to your keymap folder would look like this…

<?xml version="1.0" encoding="UTF-8"?>
<keymap>
	<global>
		<keyboard>
			<return>Select</return>
			<return mod="longpress">ContextMenu</return>
		</keyboard>
	</global>
	<Home>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</Home>
	<FullscreenVideo>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</FullscreenVideo>
	<Visualisation>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</Visualisation>
	<MusicOSD>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</MusicOSD>
	<slideshow>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</slideshow>
	<VideoOSD>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</VideoOSD>
	<Videos>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</Videos>
	<VideoPlaylist>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</VideoPlaylist>
	<MusicPlaylist>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</MusicPlaylist>
	<FullscreenLiveTV>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</FullscreenLiveTV>
	<TVGuide>
		<keyboard>
			<return mod="longpress"/>
		</keyboard>
	</TVGuide>
	</keymap>

@elmojo

But it also weirdly shows me an “alternate” list of items in my library.

It does not seem weird to me to have the ability to quickly and easily cycle between showing only unwatched and all items in a library view.