Starting with Pearl Theme release 1.5.5 (October 20, 2017), Frontend Options functionality is improved, and the options are now available at store view level. For this reason, a different approach is necessary when using the theme on multiple store views.
Sharing the same theme with the same locale language on multiple stores/store views will lead to overwriting the LESS/CSS files and potential design/functionality issues.
To avoid potential conflicts, you should use a separate set of LESS/CSS files for each individual store/storeview. In order to make sure you have separate sets of LESS/CSS for each store/store view, please choose one of the following approaches below:
1. Use different store locale options (EN, FR, ..) for each store view when using Pearl Theme on multiple store views.You should not have the same locale language for two store views Stores->Configuration->General->General->Locale Options->Locale
2. Create different Pearl Child Themes for each store view, if using the same language on multiple store views. Please find below the steps to create a new child theme for each store view:
Go to /app/design/frontend/Pearl/
Duplicate weltpixel_custom directory (with all sub folders and files) and rename the newly created folder to weltpixel_custom_storeview2 (or what name you want to use for the custom child theme).
Go to /app/design/frontend/Pearl/weltpixel_custom_storeview2/theme.xml
Open the file for editing, and change the <title> of the new child theme, as shown below:
<theme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/theme.xsd">
<title>Custom Pearl Theme for Magento 2 - storeview 2</title>
Go to /app/design/frontend/Pearl/weltpixel_custom_storeview2/registration.php
Open the file for editing and change the new theme path:
Go to Admin->Content->Configuration
And apply the newly created child theme on the desired store/store view.