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| Update: I've realized that this modem is cr*p, it's completely locked down, not only it's not possible to get rid of the annoying extra wifi, you cannot even choose your own DNS or change the internal LAN address range. | |
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Click the red button top right marked 'Expert Mode' and all the settings become available. - screenshot from my own Sunrise 10Gbit tower modem below

DNS, DHCP ranges you name it.
You maybe should have read the manual as it tells you all this
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| 3.3Device configuration The device settings are accessible from the welcome screen by clicking onMy Sunrise Internet Box. This Section contains the following menus: •Device Info (see Sub-section 3.3.1) •DHCP (only in expert mode; see Sub-section 3.3.2) •DNS (only in expert mode; see Sub-section 0) •DynDNS (only in expert mode; see Sub-section 3.3.4) •Route (only in expert mode; see Sub-section 3.3.5 | |
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I dont see any option to remove the TV wifi though but that said can't say i'd even noticed it before you mentioned it.