Usually Onedrive has a task bar under the top of the screen,
However the task bar can sometimes disappear as per below.
A quick way to fix this problem is to clear your browser data and history in chrome.
As per below select the Hamburger menu in the top right of the map, then select history and history again.
Select clear browsing data from the left of the screen. this brings up a pop up menu. Which allows you to select how long ago you want to clear the data.