Hi Sebastian,
In the Ashe Pro theme sidebars can be enabled in several ways, first is to select page layout with sidebar, for this please navigate to Dashboard > Appearance > Customize > General Layouts > Page Layouts and choose your prefered style which includes sidebars, here is the screenshot: https://nimb.ws/Pk14rf
For sub-page use option other pages and in your case chose layout with 2 columns.
The pages which are not listed in this customizer section can also use sidebars via page options, please navigate to Dashboard > Pages > Edit page > Page Options > Show SIdebar
Please make sure that widgets in the sidebar areas are added from the back end, please navigate to Dashboard > Appearance > Widgets and check sidebar areas are filled with widgets you want to be displayed.
If all these steps are done and sidebars still do not appear on the website, let’s check the issue from your website back end, In order to assist we need to check your website from the back end, please install this 3rd party plugin “Temporary Login Without Password Plugin” which allows us to access your dashboard without sharing access details.
To better understand how the plugin works, please watch the video guide below: https://www.youtube.com/watch?v=EMu0e78OpJo
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Kind Regards
.
