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Query 1: Hide the minimize button along with the bar thar contains it :
We would like to let you know that the MinimizeButton can be hidden by disabling ShowRibbonDisplayOption property. Please make use of code snippet for your reference.
Code Snippet [C#]
this.ribbonControlAdv1.ShowRibbonDisplayOptionButton = false;
The area which contains the MinimizeButton is used for placing QuickItems ,QuickItemsDropDownButton in RibbonControlAdv and usually RibbonControlAdv will be loaded in RibbonForm. RibbonForm is a type of form which hasrounded corners and flat title bar, for displaying RibbonControlAdv with OfficeStyle appearance. As title bar will not be available in RibbonForm, QAT items space will be displayed in that location. Hence this space is needed to be maintained. Please refer with below UG link for further reference.
Query 2: When it gets pressed, it generates an error :
We could find the reported behavior and a support incident has been created under your account to track the status of this requirement. Please log on to our support website to check for further updates.
Please let us know if you need any further assistance.
//To reduce the empty space above the ToolStripTabItem
//To set anchor style for RibbonControlAdv
this.ribbonControlAdv2.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)