MacBook M3 external monitors blurry resolution

[donot]

Hi,

in order to use two external monitors with my Macbook M3 I recently bought a docking station and indeed it worked. However, the image shown by the external monitors is kinda blurry and so far I haven't figured out how to deal with this issue. According to several posts I have to use BetterDisplay but by now it does not work properly.

My setup:

MacBook M3
2x Dell U3824DW
Docking Station ICY Box

Does anyone know how to address my mentioned problem?

kind regards,
Franz