joplin/packages/app-desktop/gui/KeymapConfig/styles/keymap-shortcut-row-content.scss

.keymap-shortcut-row-content {
	display: flex;
	flex-direction: row;

	> .edit {
		opacity: 0;

		&:focus-visible, &.-editing {
			opacity: 1;
		}
	}

	&:hover > .edit {
		opacity: 1;
	}
}