editing blog not possible on Mac

Is editing a blog not compatible with a Mac? When we click to edit the blog the screen completely cuts off the left 1/3 of the blog and it's impossible to view what's there. Even using the cursor does not make it visible....it is really not compatible or what are we doing wrong?

From the image you've attached, it looks like you are using window mode on your browser.

You can try to maximize your window to fullscreen.

Also you can press 'CTRL/Command and tap 0' to make sure your browser is not zoomed in.

If you are editing on a small screen, you may need to press CTRL/Command tap the minus key a few times