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macOS Catalina has a feature where you can use your iPad as a secondary display for your Mac. I have a Macbook Pro 2016 and a 10.5 inch iPad Pro 2017. Both are officially supported for the latest versions of macOS and iPadOS and support Sidecar.

I installed the latest version of iPadOS and macOS and tried using Sidecar and it kinda works but it's extremely laggy and blurry and almost unusable and if I turn wifi off in my mac it disconnects and complains about wifi being turned off.

As far as I know this feature can work with wired connections as well and I tried connecting iPad to Macbook using a (Lightning -> USB A) to USB C adapter and also also tried using a USB 3 hub connected directly to the laptop using USB C and it still does not work.

Is there any way I could force Sidecar to work over a wired connection?

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    Did you try a direct Mac-iPad connection (without any adapters or hubs)? – nohillside Aug 1 at 9:31
  • @nohillside I don't have a Lightning to USB C cable. My USB C hub is actually part of the monitor stand and connects to the laptop with a DisplayPort over TB3 connection. – Vahid Amiri Aug 1 at 9:35
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You can use a direct USB-C to Lightning cable (I used an MFi cable by Aukey). Turn off the iPad's wifi, make sure you are signed in to the same apple ID, have iOS13 and Catalina installed. It is much faster than the wifi connection for me (and I also have less lag on my mac this way).

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    My iPad 12.9 connected via USB-C would not connect unless I gave it the Wi-Fi connection. By turning off Wi-Fi on the iPad itself, then using sidecar, I could finally connect over USB-C. Thanks! – William Cerniuk Nov 20 at 12:40
  • I tried this with an iPad Mini (2019) and MacBook Pro (2018) – didn't work. – adib Dec 1 at 3:24
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I struggled with the same problem and just now finally solved it. The issue was for me that I didn't earlier "Trusted my iPad" on my mac, and "Trusted my Mac" on my iPad. Here's a how to: https://support.apple.com/en-us/HT202778

After doing this, it finally connects via cable and is hopyfully less buggy. x'3

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