You could try something like below :
If(Checkbox3.Value && Checkbox2.Value && Checkbox1.Value,DisplayMode.Edit,Disabled)
![enter image description here](https://i.stack.imgur.com/B1toz.png)
When everything is checked :
![enter image description here](https://i.stack.imgur.com/yIteS.png)
Code explanation :
It does an & - And
Operation for all the checkbox values and if all are true (Checked), then the button displaymode will Edit else will be in disabled state.
![enter image description here](https://i.stack.imgur.com/WeYdo.png)
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