Canon PowerShot SX70 HS Digital Camera - Manual (Page 197)

Setting the HDMI Output Resolution
Set the output resolution used for camera images when connected to a
television or external recording device with an HDMI cable.
1
[HDMI resolution]
Auto
Images are automatically displayed at optimal resolution for
connected televisions.
1080p
Output at 1080p resolution. Select if you prefer to avoid
display or delay issues when switching resolution.
197