I am not sure how much this is possible, Mohit or someone from Tinxy can confirm on this. AFAIK this is not directly possible. If it’s single node 16A switch you can disable the physical switch or enable it from App. You may enable the manual switch after turning on the switch from the app. What is your workload? If you are planning for entire house check your workload before doing this.
not the typical solution, but if you are out of options, you could use a 2 node tinxy and use one of the relay output to the switch. that way, the second relay will always control power to the switch. I use a similar (not exactly like I explained in this reply) setup to cut power to tv so that my kids will not turn it on unless I want them to.