Off-canvas dialogue items width not uniform

Problem/Motivation

The paragraph list items do not have the same width in the off-canvas dialogue selector.

Steps to reproduce

I came across this problem when my site's Drupal Core version updated from 10.3.6 -> 10.3.9 (with dependencies).
Enable `Use off-canvas instead of modal dialog` in the Manage form display for a paragraph reference field.

Proposed resolution

Add `width: 100%;` css style to `.paragraphs-button--add-more` class in `paragraphs_ee.off_canvas.scss`