I need some help fixing my cache drives. I am so new to Unraid I assumed if one drive was good two would be better and they would just add to total cache size but it appears that it does some sort of raid 1 with the cache drives makeing the total cache size the smaller of the two. How would I go about removing the small drive here from the cache until my 2tb nvme m.2 shows up next week?

Pool Devices Current

Right now my download speed is too quick and it always fills up. I am ok running only 1x drive for the short term but in the next week or so would probably like to have 2 if that is recommended. Mostly I just want to be able to use the full 2tb of the current drive.

Thanks!

Your pool device link goes to a discord 404... we wouldn't have been able to see it otherwise...
picture of the main tab... Please post unraid diag...

Review the Unriad docs:

Storage Management | Unraid Docs

Storage Management | Unraid Docs

To assign devices to

Look into raid...
https://en.wikipedia.org/wiki/RAID

As You are new I don't think that is correct:
"appears that it does some sort of raid 1 with the cache drives makeing the total cache size the smaller of the two"

as disks lie about there storage. a nvme 1 TB dicre a 1 TB ssd and a 1 TB HDD due to brands and space will report 1 TB but all have different sizes.

RAID 1 consists of data mirroring,
this will take the "Lowest" size avable across all disk in the Raid setup and duplicate data between both disks.

so if 1 disk is smaller its due to the orgianl sector and space it orgaily had.

While advsed ber the doc as RAID is not a backup... Its redundancy and hellps maintaing uptime in the evnet of the eventual disk failure.
MIrro keeps the data that is used between both disks.

If you wanting better mirro and space you need a min of 3 disk or aprox the same size.
3x 1 TB disk can then be put into a "raidz1" zfs where data acts as a raid 5
a file is fully on 1 disk and the same file is split on the other 2. this increase read write times and lowerers Computer Iops.

(Makes the system faster...)

more on zfs raid:
https://www.45drives.com/community/articles/RAID-and-RAIDZ/
https://en.wikipedia.org/wiki/ZFS

"Right now my download speed is too quick and it always fills up. I am ok running only 1x drive for the short term but in the next week or so would probably like to have 2 if that is recommended. Mostly I just want to be able to use the full 2tb of the current drive."

Sounds like you need to look at getting more storage and setingup a different grouping of disks...