Thank you for reporting this, we know how frustrating it is and we are working on making the functionality a lot better.
Drabwoard PDF Product ManagerAlexander commented
Same problem with Ctrl+Z on occasion
Whilst there are a few requests in here, there is one that we would really like some help with.
It is around the merging and splitting of documents. We are doing some work in this area at the moment, and we would like it if any of you who use the Document Builder tool within the app, can help us out by doing some testing with us.
If you are interested please send me an email at firstname.lastname@example.org and we can organise a call next week to show you what we are up to.
In regards to some of the other requests in here, such as re-ordering the open documents tabs, we have some plans for that in the near future too. So keep an eye out for it.
As always, thanks so much for all your support of Drawboard PDF!
Drawboard PDF Product ManagerAlexander commented
I support the issue, this seems like a relatively basic and functionality with no drawbacks to it and I personally need this flexibility.