[Live kali linux] How to use the whole storage capacity availaible

Hello everyone ! I hope I am posting in the right section here.

I am new to kali (to linux actually) and I would like to know how to use every Gb available in my penstick.
I tried to use the persistence but the PC becomes way too slow afterwards.
My usb is 32 Gbs and as we can see in the following screenshot, i have only 3,8GiB for my file system
Attachment 4460

Code:

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fdisk -l
Disk /dev/sda: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: TOSHIBA MQ01ABD1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: AC3C0AD5-8CDF-4CC1-B758-E1996DB85B6D

Device          Start        End    Sectors  Size Type
/dev/sda1        2048    206847    204800  100M EFI System
/dev/sda2      206848    239615      32768  16M Microsoft reserved
/dev/sda3      239616 1315055615 1314816000  627G Microsoft basic data
/dev/sda4  1951424512 1953521663    2097152    1G Windows recovery environment


Disk /dev/sdb: 28.64 GiB, 30752636928 bytes, 60063744 sectors
Disk model:  SanDisk 3.2Gen1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x048819e6

Device    Boot Start      End  Sectors  Size Id Type
/dev/sdb1  *    2048 60063743 60061696 28.6G  c W95 FAT32 (LBA)


Disk /dev/loop0: 2.94 GiB, 3155832832 bytes, 6163736 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

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Thank you guys for your help