for large flows, I am not able to increase the maximum dimensions of the diagram
Thank you for letting us know your questions. There most likely is a limit in the total size of a diagram (as it is with the limit of characters for the text in each element). However, please know that if you are hitting this limit it means that your model is too big, and we would rather suggest that you make use of sub processes to simplify it, according to the best practices of BPMN modeling described here: https://help.bizagi.com/process-modeler/en/index.html?best_practices_in_modeling.htm#best%20pra
Now, to answer your question, there is no feature to increase the limits of a diagram once you've reach its maximum size, so we apologize for this inconvenience.
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