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Sorry for the delay. We have analyzed the reported query in our end. I am afraid that I am unable to reproduce the issue in our end. Please use the below code to fill the grid in client area. This will may avoid the gap between the grid.
this.gridControl1.Dock = DockStyle.Fill;
Please refer the below sample file from below patch. We hope this will resolve all your required information.
<Installed_Path>\Syncfusion\EssentialStudio\<version>\Windows\Grid.Windows\Samples\2.0\MS Excel-Style Features\Workbook Demo\
Please provide the sample which is reproduce the issue in your end. This will help me to find the exact solution.
Sorry for the inconvenience caused with delay.
We have analyzed the reported forum query in our end. The provided sample file is very helpful for the further analysis. From your word document you have requested to change the position of the visible controls in tab page. You can change the control position by location. You need to check the location manually and assign this new location to control. Please refer the below code.
this.groupBox1.Location = new System.Drawing.Point(4, 22);
if you have any concerns on this please provide the screenshot as the requirement details in this we will update the exact solution for you.