If you want, you can enlarge the font of the numbers that appear along edges to tell you how many records went along them. To do that, select Window → Preferences...

Figure 16.3. Enlarging the Font of Numbers

Then, expand the CloverETL item, select Tracking and select the desired font size in the Record number font size area. By default, it is set to 7.

Figure 16.4. Setting the Font Size