Kathleen,
Not sure why you were forced to update , unlike WordPress , Store Locator Plus NEVER  auto updates.  If you did update SLP to version 5.0, did you also update the Power add-on?
You have not provided enough information or acreenshot of your plugin environment for me to be able to see what versions you have. (see posting guidelines)
.   The sidebar  under StoreLocatorPlus would not show SEO Pages  unless you have  Enable Pages checked off, under general/Server. Perhaps that was reset, there was an issue with that in one of the  previous versions.
Please refer to:
https://docs.storelocatorplus.com/blog/enable-pages-setting/
 
Also some  information about Manual vs auto updates and settings being undone. How to prevent this:
https://www.storelocatorplus.com/manually-updating-wordpress-plugins/
 
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