Hello!
I have attached two screen dump pictures. I have tried everything, also restore default settings, but it just stay there.
It is different in manual. Manual details are from different FW version. Manuals are not fully updated after every FW change.
In this case it is logical that FFT cursors are shown in FFT window and not on YT window. But what is logical for FW programmer is not always best for equipment useability. (UI handling ergonomy and visual ergonomy design need more than just skills for do program code. Example in this case YT window is not so important than FFT and it is better to overlay YT window than FFT window. Just only label it so that cursor information is from FFT)
Also some (user adjustable) transparency, position and color settings may develop better (Siglent!)
If you use overlayed FFT display mode this small cursor window is left top. Overlay (not separate window) mode it is mostly practical to adjust YT trace as dim as possible.
Also if there is important part of FFT trace under this cursor window you can horizontally move FFT trace.
I can also see that using FFT may need some more exercise for find more useful settings for signal under test, depending what want look. Many times 20dB/div is wrong, due to fact that 40-50dB is max useful dynamic range of this kind of FFT (theoretically 8 bit but in practice less due to analog front end noise and ADC noise(s))
Then, it need carefully think what are signal under test things what want look. Then think what is maximum frequency wanted for FFT. Then select sampling speed for this. Example, if look 1kHz signal and want see range from 1st to 11th harmonic. It is 1 - 11kHz. To Mr Nyquist we give double and we need least 22kSa/s. (no it leaks and it is impossile to select in this case) 25kSa/s is also very borderline. Lets select 50kSa/s so FFT freq range is 0 - 25kHz
Adjust YT horizontal speed (and or memory in some models) so that sample rate is 50kSa/s.
Ok, now YT display is nearly as useless. (this is FFT and if we can not zoom YT so that there is used same sample points as FFT is using, then it is as it is but FFT works now nearly optimal related to resolution. (In SDS2000 there can can use windowed YT zoom with FFT (but not zoom directly to FFT used sample points)
It need remember that these simple machines FFT use 1024 sample points and result is 512 point FFT) There is now FFT left 0Hz and right 25kHz. This trace include 512 points horizontally giving around 50Hz resolution. For some amount better visibility you can zoom FFT 2x or 5x. Then of course need shift FFT horizontally so that this part what you are looking is visible. (push once "math" and some controls works now for FFT)
Also of course then select example 10dB/div and vertical shift FFT so that noise level is visible, so you have visible whole dynamic range from noise to maximum level. With YT display need carefully check that sany part of ignal do not clip. (best to think 8 vertical div is max. (true max is around 10 vertical div))
It need also some exercise how to do FFT adjustments. (knobs function change)
Also input channel separate DSP (low pass) filter optimal settings may help in some situations.
If use FFT under 5-10MHz use always analog BW limit on for reduce noise (noise aliases from over Nyquist limit) And more, if use probe, it can also use as some poor low pass filter using 1x instead of 10x. (corner freq is somewhere 3-6MHz or something like it)
I can see you did not use "Print" button for take screenshot to USB. With this function you get image what is just as on the TFT and also so that all menu is as it is displayed when push "Print" button. (no need use Save/Recall menu and also if want, right menu can shut off for more room for signal in image or if want show some menu, it can do using "Print" for image so that right menu can be as it is).
(Suomeksi tämä olisi helpompaa.)