Official Monero GUI issues - downloading blockchain again?

Good day, fellow deviants. It is I, Dark_Armadill0.

So I found myself running into an error with the Official Monero GUI (monero-gui-linux-x64-v0.18.2.2). The error: when trying to mine with P2Pool, the Status says: Starting P2Pool and doesn’t update/change/improve. It hangs. For hours. Like overnight. I see nothing happening via my System Monitor (think Task Manager in Windoze), nor any helpful pop-up or message from the Official Monero GUI. P2Pool log offered no helpful insight, other than something about monerod out of sync, retrying in 1s and spamming the log with that same message.

So, realizing things just aren't working correctly, I decided to wipe the Official Monero GUI from my system and start over. This said, the Monero GUI remembered my previous settings. I want a totally clean slate here. I closed the app, and relaunched the Monero GUI this time with superuser rights (think Admin powers in the Windoze world), and it started syncing the Blockchain. Again. Which means I fear there are now two copies of the blockchain being saved to my disk. I’m running out of space fast, and the GUI keeps on downloading more.

Burning question 1: Where is the P2Pool blockchain saved on Linux systems? Can I delete the directory/contents so that I have a fresh clean slate, to then re-downloaded the P2Pool Blockchain?

Burning question 2: Is this the best course of action for me to take? Or am I going needlessly too far in trying to solve a “Starting P2Pool” hanging error message?

Burning question 3: I see in the fresh instance of Monero GUI that there is no longer a P2Pool log file. It's pretty spartan in the Monero GUI directory. What to do here?

Thanks in advance!