Dahua IPC-HFW2431T-ZS-S2 Operation Manual page 83

Step 2 Select the font color and size.
Click More Color to customize the font color.
Click Save.
Step 3
4.5.2.3.6 Configuring Picture Overlay
You can enable this function if you need to display picture information on the video image.
Text overlay and picture overlay cannot work at the same time.
Procedure
Select Setting > Camera > Video > Overlay > Picture Overlay.
Step 1
Figure 4-61 Font attribute
Figure 4-62 Picture overlay
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Operation Manual