Thanks for contacting Syncfusion support.
Currently, we do not have support for “Increasing the space” in the Desktop designer.
We would like to inform you that the desktop version of dashboard platform is moved as legacy and moving forward, we will be implementing new features and improvements only in the Bold BI platform (https://www.boldbi.com/). We are also working on providing an on-premise version of Bold BI, which will be available in the mid of august 2019.
Please watch out the Bold BI space for further updates.
Please find the documentation link for Bold BI.
We have planned “Dashboard size customization” feature in our current year road map. Also we have logged it as feature request in our feedback portal.
Please upvote this feature to make this our priority. While this feature itself is important we will prioritize the features every release, based on the user demands.
If you have any more specification/suggestions to the feature request you can add it as a comment in the portal.