Hi,
We understand that moving to a new framework/component set and rewriting your application can be a stressful operation. May I remind you that in the process we acknowledged this and offered to smoothen the operation and extend the period by allow you to install TMS FMX UI Pack in Delphi 12. (FMX UI Pack Delphi 12 Support (Installer) - #2 by Pieter_Scheldeman)
This way, the time and effort it takes is delayed and allows for a stress-free transition. Although, more than 2 years ago, we decided to no longer actively support and extend TMS FMX UI Pack with new components and features, we are still more than happy to assist you in the process and try our best to ease the transition by fixing bugs in Delphi 12 (tableview issue at rotating on iOS with detailview controls assigned - #23 by Pieter_Scheldeman). Unfortunately not everything lies within our power and with the complexity of the frameworks and multitude of IDEs makes it difficult to apply bug fixes.
Please also understand that the FMX framework no longer allows us to provide the best case scenario for our customers and such decisions are not made lightly. They are made to be future proof for IDE / framework upgrades.
Either way we regret the style of communication that has been applied in this post, nevertheless the responsible developer will do his/her best to address the issues you describe in your post related to the task dialog as soon as possible.