With the Zakra Theme, you can show different sidebar on a specific page. Just go through the following steps.

From your WordPress Dashboard, go to the Pages > All Pages section.
Now choose the required Page that you want to customize.
At the bottom of the page, check for the Page Settings option.
Under the Page Settings option, go to the General option.
Under the Sidebar option, user the dropdown list to choose which sidebar content to show.

Note: If you have chosen the Left Sidebar in the Layout option and you chose the Right Sidebar in the Sidebar option, then the content of the Right Sidebar will be shown in the Left Sidebar.

It is shown in the image below:

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