Your design change for the specified retailer intersects with one other one, please specify one other date vary
The standard strategy to swap to another Magento 2 extension theme, after you’ve downloaded and installed it, is to log in to your Magento Admin Panel, go to System >Design, click on on the Add Design Change button, select the theme from the Custom Design drop-down menu and press the Save button.
However, when you attempt to change the theme with a third or a fourth one, using the same steps, you may get an error message:
There is a very easy way to deal with this drawback. When you go to System > Design you will see a table in the course of the page. The last row lists your current theme (in this case “default/fashionable”):
Simply click on on it, select the theme you want from the Customized Design drop-down menu and press theSave button. You’ll see a message “The design change has been saved” and the theme listed in the last row of the desk can be totally different (in this case “default/magezon”):
Magento themes tutorial
Then you definitely just have to open your Magento homepage to see the new theme.