I presume the original poster is doing spatial notation of some type, which is very common in contemporary writing.
Hiding rests in Dorico is generally not a very good idea. Dorico spaces things as if the rest was not there, so when doing spatial notation, if the first half of the measure is blank, Dorico will simply collapse the first visible object back to the beginning of the bar. You could end up with other weird things happening if the spacing algorithms are confused.
Instead, the best approaches are to either scale the rest to 1% size (where it is so tiny you cannot see it) or apply a transparent colour using the alpha channel setting. Making the rest transparent avoids you from having to move it and make it white, it can be left at the default position.
I would also suggest, if possible, to use the rest values to try to get the spacing already mostly correct without having to make manual horizontal adjustments. These horizontal engrave mode adjustments can be easily lost if you go back to make changes to some of the notes. I have had it happen where some quick requested edits wound up destroying the spacing and I did not immediately notice that the spatial representation was wrong.
In this case you would probably get close to the spacing you want by beginning with a sixteenth rest and then having the fermata above a dotted eighth rest, which should give you approximately the spacing you want without having to resort to manually shifting things horizontally in engrave mode. After that, take those rests and instead of hiding them, make them 1% size or transparent with the alpha channel. As I stated above, I’ve learned the hard way that edits can undo all of that hard work and then I have to shift things all over again.