Windows client provided support to build 'dynamic' pages using collapsing tree views. Collapsing / expanding tree nodes was userfriendly, since it limits the information shown when loading the page and allows to user to decide on what node / level information was needed. However, since the move to the Webclient, collapsable tree views seem no longer supported, since the ShowAsTree and IndentationControls properties behave differently. https://docs.microsoft.com/en-us/dynamics-nav/feature-limitations-of-the-microsoft-dynamics-nav-web-client Please re-enable collapsable / multi-level tree list support in the Modern client. Preferably with extended with the option to collapse / expand per level (1 / 2 / 3 / ...). Cfr. the experience Azure DevOps offers in their Backlog overview to show work items with/without childs.