Just some simple CSS to disable the lil “x” next to each value in properties. It doesn’t get rid of it visually, just makes it un-clickable so you don’t accidentally tap/click and delete things. You can still long press, right click, backspace, or enter Source Mode to delete properties.
.metadata-property-value .multi-select-pill-remove-button {
pointer-events: none;
}
Related feature request:
Tangentially related feature request: