Hello,
To get the widgets as per your query, you can go to Admin Panel > Appearance > Widgets and add a ‘Navigation Menu’ widget in Primary Sidebar. You can refer to the screenshot given below:
https://prnt.sc/rlrjof
Then to show that sidebar in the position as per your requirement, you can edit the individual page by following the path Admin Panel > Pages > Individual page(edited) and select the layout settings dropdown.
You can refer to the screenshot given below to be more clear:
https://prnt.sc/rlrlwl
https://prnt.sc/rlrl5e
Hope this helps.
If your query is not regarding the left widget then provide us the screenshot marking the section.
Regards.