re: …drawing window minimize/maximize icons.
I don't know how to make those larger. You could use TurboCAD's "Window" menu and use "Cascade" or "Tile" to show the drawing window(s) within the drawing area; they'll have the larger, normal looking icons in the upper-right. "Ctrl+F4" will close a drawing. "Ctrl+Tab" will cycle through the open windows.
re: …Icon on the left.
Right-click in an empty toolbar area to open the "Customize" dialog. On the "Toolbars" page you'll probably find a "Custom 1" toolbar. Uncheck that and it should go away. If you want to move it, hover you cursor over the left edge of that little toolbar. When you see a 4-way arrow, click, hold and move to a new location.
re: …Tools palette.
Click on the red icon next to the Templates name in the Tools palette, then click on the "Large Icons" option. There's only one size, 32 pixels.
Designer, Deluxe, (Professional, Expert, Basic), Platinum
Windows 10 Pro (1903), 64-bit