ᐅ Gap in kitchen unit? How do I close 79 mm?

I have planned my IKEA Bodbyn kitchen in gray for the umpteenth time.
But I have a problem: there is a gap on one side.
We have a fairly new wood stove in the kitchen that will stay.
The new kitchen will fit right next to it. Spacers have been considered. Still, there is a 79 mm (3 inches) gap left.
I don’t know how to close it. It’s too narrow for a towel rail. Leaving it open is also not ideal because it’s hard to clean inside and things will probably keep falling in, making them difficult to retrieve.
I thought about using the baseboard vertically, but it is 80 mm (3 inches) wide, so that doesn’t work. The crown molding is 6 cm (2.4 inches) and doesn’t fit either.
Using the countertop as a side panel doesn’t help either because there would still be a gap.
Does anyone have a neat solution?
Thanks in advance for any urgently needed advice.
Anita

We also have a gap in our current Ikea kitchen. It was planned exactly so that the narrowest drawer front fits vertically into it. Glued onto two wooden battens.
If you can’t get your gap to this matching size, your only option is probably a circular saw to adjust a front (which means the edges won’t be rounded) – or maybe you’ll get another suggestion.

Simply place a cover panel in front. As my predecessor already mentioned, have the drawer or cabinet front cut to size yourself using a wide saw or have it cut by a carpenter. It doesn’t cost much and looks neat. This is also how it is usually done in standard kitchens.
Unfortunately, the space is lost in this case, but kitchens are generally designed in 10cm (4 inches) increments.

You can also leave the area open, but extend the countertop all the way to the wall. The 79mm (3 inches) gap (are all the walls perfectly straight and at a 90-degree angle? Often there are deviations that are compensated with a gap) can then be used as vertical storage for baking sheets.

Otherwise, start cutting at one board/cabinet front [emoji2]

In our case, there’s a broom stored there. At least that way it can be found. However, there is a 12 cm (5 inch) gap next to the tall cabinet. The filler panel is still in the garage. We decided during the kitchen installation to leave it open. It’s practical. Karsten

Order the appropriate cover panel. Take it to your local hardware store (e.g., Globus Baumarkt), and have it cut to size. It costs 1 euro.