The tricky thing with continents is how the ocean currents affect the weather. For example the current flowing north from the equator past the UK keeps them relatively temperate while they have the same latitude as Canada.

The cycle of nutrients in the ocean is also temperature dependent. The cold water on the sea bottom concentrates the nutrients from decaying matter. Currents are needed to spread these nutrients. If cold water was trapped in circumpolar currents, warm waters could become depleted and unable to sustain much sea life.

I will not help an omnipotent time traveller reshape the past Earth, I simply will not!

I'd kinda want to bring doggerbank back, buuuut then i'd miss the irish and british cultures

Straight Pangea. No oceans would mean everybody meets each other early on. All humans quickly build a world wide communication network, even if only by word of mouth at first. Sure, there's will be some looking and conquering, but I think that my this point in time, we'd be a hell of a lot closer to unity.

Figure out some configuration that would minimize the impact of the meteor that took out the dinosaurs. Maybe mammals won't thrive and we won't have whatever the fuck this is.

On a functional basis I expect some sort of belt around the equatorial region or perhaps a bit outside of it, whatever makes for the most fertile and productive land.

It'd be particularly full but would probably also eliminate a lot of global conflict since one chunk of clay would be about the same as a other, far less reason to fight over territory.

All continents surrounded by mountains reaching into space

Ideal for what?

For human growth with modern infrastructure?

For a rich diversity of ecosystems to encourage certain evolutionary paths?

For... third thing... idk someone said weather?

There's no way I can try to answer this without actually being the watchmaker and having a perfect understanding pf the consequences

Move all landmass to the southpole and give up on life on land

You would be randomly born into this world when you finish, so that's your motivation

I like band idea, but I’d make it a big band of Voronoy pattern shaped islands, with just enough water in between for civilisations to ensure communication, but make invading each other a pain in the ass. Would probably also make some water regions shallow to act like some sort of water speed bump and limit seafaring capacity and force humans to eventually be building big ass bridges.

Would probably also make some outlier islands with difficult inhospitable terrain or climate to act as nature’s reserves.

Form it into a huge bust of Trump. We all can live on it. Like in Corsair Cove. The game where you place your buildings and pathways vertically, attached to a wall.

I imagine having a small garden on his left nipple, with an insect hotel and maybe a patio swing.