On the main form, there is an element of the panel that the “user control” is loaded into it; when you expand the window to full screen, the elements inside the control do not stretch.
Here is the code snippet where the control connects:
private void kontr_btn_Click(object sender, EventArgs e) { kontr_control kontr = new kontr_control(); content.Controls.Clear(); content.Controls.Add(kontr); } How to stretch elements inside a child control when expanding a window?