You might just be zoomed out on the document. Hitting '0' should bring it back to 100%.
If it does nothing, then you might have accidentally cropped the document. Use Document: New Document to create a new one (you can set the desired size there, or just turn on the 'wsize' button to have it automatically use the available window space. Then redraw the tool onto the new document and edit like normal.
Replies
If it does nothing, then you might have accidentally cropped the document. Use Document: New Document to create a new one (you can set the desired size there, or just turn on the 'wsize' button to have it automatically use the available window space. Then redraw the tool onto the new document and edit like normal.