If your article contains images in very different sizes, it may be difficult to find the appropriate zoom to review them in the WYSIWYG pane on the Articles main tab.

Therefore, you may want to activate the "normalize" feature for such images. The  preference is under Edit > Preferences > WYSIWYG > Display > Picture size. Enter a suitable value in the Min and Max boxes. If you enter a similar value in both boxes, all images will appear in the WYSIWYG in the similar size, independently of their real size.

For example, if you specify 100pt in MIN, and 100pt in MAX, all the unlinked images are normalized to that size: the images, smaller than 100pt are enlarged; the images, wider than 100pt are reduced.