The measure tool disappeared in my ArcMap. Also, the zoom in and zoom out bar is grayed out in the Data view, but will show in Layout View. My tool panes look like below in the Data View. I appreciate if anyone could help me. Thanks!
The zoom in/out tools are greyed out because those are the layout zoom in/out tools, on the Layout Toolbar. They only work in layout view.
Somehow, your Tools Toolbar has been removed (it has the normal zoom in/out tools, as well as the measure tool). To add it again, right click an empty spot in the toolbar area and choose "Tools".
Thanks for your quick reply. Yes, I found these tools back. Thanks a lot!
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