See the page under shortcodes here in documentation:
https://docs.storelocatorplus.com/blog/slplus-shortcode-options/#allow_addy_in_url
As a side note:
Please note, the developer has created a new SLACK channel where the progress on updates to any SLP add-ons are visible to premier customers . This is a separate forum where you can cite issues and communicate with the developer or Premier support team. This is an excellent mechanism to see what is being worked on, to discuss issues and suggest resolution to, to report or see progress of fixes, to share ideas with the developer and his team.
Please contact us for an invite if you do not already belong to #talk-about-slp on the Charleston Software Associates Slack channel