Turn off the autocenter property and when the form opens, it will open in the position where it was when you saved it in design view. If that doesn't solve the problem, then you can use code to move the form around after it opens.
I'm trying to force an MS-Access form to take a certain position relative to the right edge of the main window (actually I want to center it, but I can see also wanting to dock it to one side or an...
stackoverflow.com
From there, remember that the "anchor point" in Access is the top left corner, which is to say (top=0, left=0). So you can set the form's position to the far left as 0, but to set it to the bottom of that area, you must take the bottom as determined from the parent window size and subtract the form's height to place the form vertically at the bottom of the window.
You must also understand that the forms open within access and not anywhere.
Therefore you must maximize access to cover everything and position your forms as desired.
If what you want is to show other applications, you will have to modify the access form in me.app and other ways.
You can also make the access form not visible, but that is more difficult.
DoCmd.RunCommand acCmdAppMaximize
This maximizes access, then you can maximize or position each shape as needed.
or/and acCmd
acCmdAnchorBottomLeft
616
acCmdAnchorBottomRight
618
acCmdAnchorBottomStretchAcross
617
acCmdAnchorStretchAcross
611
acCmdAnchorStretchDown
613
acCmdAnchorStretchDownAcross
614
acCmdAnchorStretchDownRight
615
acCmdAnchorTopLeft
610
acCmdAnchorTopRight
612
DoCmd.Maximize
also
Use vba or seting form
Me.AutoCenter = xx
Me.AutoResize = xx
Me.WindowHeight = xx
Me.WindowLeft = xx
Me.WindowTop = xx
Me.WindowWidth = xx