Siemens SINUMERIK 840D sl Commissioning Manual page 168

Commissioning NC-controlled drives
6.6 Diagnostics → Trace
5. Select the "Zoom +" softkey or the <+> softkey to enlarge the image section.
Using the cursor keys, you can move the image section:
6. You can undo the action using keys <CTRL> + <Z>:
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CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA