Is it possible to keep a glyph’s preview screen when creating a glyph the preview background is removed upon creating a new glyph how could I keep the preview and the newer glyph.
Why? You are not supposed to copy the system font. And it is not supposed to influence you while drawing.
If you want to see the same character in other fonts installed in the system, try the UnicodeChecker link, the arrow next to the Unicode in the grey info box.