The position of your ad is determined by the allotted weekly budget. Yandex.Direct automatically sets bids for your ads to keep advertising expenses within budget. If your ad is only displayed on the All ads page, try increasing the size of your budget.
If you would like to change ad bids yourself, switch to the Professional interface of Yandex.Direct. To do this, open the My ads page and click the Switch to Professional interface link at the bottom of the page. Make sure that Professional is selected in the window that appears and click Start using the service.
You can read about how to change ad bids in the Professional interface in the Help section.