Flight Crew Instrument; Flight Crew Multiengine
Distraction; Situational Awareness; Confusion
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Human Factors; Environment - Non Weather Related
From the ZZZZZX arrival approach gave us a clearance direct to ZZZZZ on the ILS XXL approach. The PM selected the ZZZZZ fix from the DIR FMS page and asked if I agree; I visually verified that direct ZZZZZ was selected and replied I agree and to execute the change. The PM then stated we need to make the 176 course big; and I agreed. After the change was made I verified on PFD1 that the aircraft was in white needles with NAV captured and the fix was ZZZZZ. A few moments later approach asked us if we were going direct to ZZZZZ; and again I verified on PFD1 that the aircraft was in white needles; navigating to the fix ZZZZZ. The PM confirmed that we were direct ZZZZZ. Approach then gave us a HDG to the right of our flight path to fly. I dialed in the requested heading (I think it was 125) and selected HDG on the FCP and verified on the PFD1 that the aircraft was now in HDG mode. Trying to determine what had happened and why we need a course correction I noted the flight path on PFD2 that showed we had been tracking the last heading as an intercept for the extended LOC course outside of ZZZZZ. A brief discussion of what had happened with the PM was conducted and we both agreed that we should not have entered the course; which tells the FMS that you want this heading to intercept; and that it should have been left as the course direct to ZZZZZ as this was the clearance. The approach was conducted without further incident.This was my first flight as Captain after almost X years. I had just completed IOE the previous week; which had multiple interruptions including being taken off line because my IOE Check Airmen had been exposed to COVID. I flew one turn as an FO the previous day; and this flight. I believe my concern to be open to correction caused my response to want to agree with the PM; and this was a common error I had made during training as well; not making the inbound course 'BIG' to have the FMS adjust the flight profile for an intercept as opposed to flying to a specific course. Just because I had made this error before; does not mean that I will make it again; I should have stated out loud why I did not initially ask to make the course big; because I heard the clearance as direct to the fix; not intercept; which we were primed for; due to our position in the flight. Additionally when ATC questioned if we were going direct to ZZZZZ; I check PFD1 to read the status of our navigation; and seeing ZZZZZ as the fix; and NAV captured and in white; believed this could only be the case. In all my time flying this type aircraft; I don't know if I have ever been aware that this shows when intercepting the course; as you would usually see HDG mode to capture. Additionally; the slight difference in the flight path was not great as displayed on PFD2 in the map. This will definitely change the way I verify the mode the aircraft is in; to include tracing the flight path on PFD2.
We were on descent via ZZZZZX Arrival.  We were cleared Direct ZZZZZ before the last fix of ZZZZZX Arrival on the Visual back it up with (ILS) for Runway XXL.  I was PM and selected ZZZZZ and placed it in Magenta line select.  It was my fault for doing the procedure as if we are sequencing for the approach.  So; I select making the course big on the right line select side.  I did asked PF to confirm before executing the FMS.  That ended up extending the centerline and the aircraft continued to fly it current heading tracking toward the extended centerline.  Roughly; after 30 seconds Approach Control came on and asked if we are direct ZZZZZ.  I verified the FMA as well as on the left side of the compass rose on the PFD.  It [was] displaying ZZZZZ and in white FMS letter.  So; I responded that we are going direct to ZZZZZ.  Approach after that gave us a heading of 125 to have the aircraft position heading toward ZZZZZ.  After that both PF and I talked over to see what went wrong during the execution.  We both came to an agreement that it was due to my mistakes for making the intercept course big.  After we heard toward; ZZZZZ Approach cleared us to join the LOC for XXL and we called for the field in sight.  We were cleared for the visual for XXL.  Everything and aircraft landed safely without any other issue. My suggestion is to be more vigilant and [have] more situational awareness.  Especially; if you don't fly often.  As well as making sure understanding what you are selecting and understand clearance fully.
Air carrier flight crew reported a track heading deviation during arrival and both pilots cited lack of flying as a contributing factor.