... on VARCHART XGantt:
How to Indicate the Vertical Height of the Group by a Color

1) Create a filter for each grouping level which selects for the title row of the group.
Filter conditions of grouping level 1:
<Group-/summary node >=1 AND <Grouping level>=1
Filter conditions of grouping level 2:
<Group-/summary node >=1 AND <Grouping level>=2
etc ...

2) Generate a table format (group title row) for each grouping level:
a) Please assign the filters of step 1 to the corresponding levels
b) For each level above, add a preceding "empty box": create a column and do not assign it a data field or constant text. Column 1 receives the color of grouping level 1, column 2 receives the color of grouping level 2, etc.
c) Behind the empty boxes put a cell named by the pre-defined <Group title>
d) Assign the color of the current level

3) Do analogous settings to the "Standardlist" table format of the base rows:
a) For each level above, add a preceding "empty box" that has the color of the corresponding level
b) Define all other cells required behind the empty boxes
c) Assign own base row colors to these cells

4) Separators:
a) In the column titles, only switch ON the two outer separation lines.
b) In all other formats, switch OFF both separation lines.