Hello, I would like to get rid of the Secondary Sidebar on a page in order to integrate a wider map. How could I do this ? Many thanks.

You can tell me detail about this issue and send me a screenshot for further checking.

Thank you Dominic for your follow-up. Concerned page on my side is : http://cuicui.be/map/ . I would like the right sidebar to go off in order to have bigger space for implementing a map byhttp://www.codespacing.com . Here is enclosed a capture-screen expressing the idea. The red area would be the space dedicated to the map.

To create a new page with fullwidth, please do as the following:
Step1: Please download the fullwidth.php file in the link: https://www.dropbox.com/s/2cpe9wrl0hu3he1/fullwidth.php
Step2: Copy & paste the fullwidth.php file in to the folder path “\wp-content\themes\dw-minion”
Step3: Log in to Dashboard > Pages > Add new, in the Page Attributes pane on the right hand side, select the template as Full width.
Step4: go to Appearance > Customize > Custom Code then add the following code to the “Header Code”

  <style>
.page-template-fullwidth-php .primary-inner {
    margin-right: 20px;
}
</style>

Hope this helps !